Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Assets [Abstract] Assets Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents (including short term investments of $7,044 and $10,848, respectively) Cash and cash equivalents (including short term investments of $6,615 and $6,158, respectively) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Available-For-Sale Securities, Current Securities available-for-sale Securities available-for-sale Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $38 and $44, respectively Accounts receivable, net of allowance for doubtful accounts of $45 and $45, respectively Prepaid and Refundable Income Taxes Prepaid and refundable income taxes Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer. It also includes carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Deferred Tax Assets, Net Of Valuation Allowance, Current Total federal, state and local tax benefits Deferred income taxes Deferred Tax Assets, Net, Current, Total Deferred Tax Assets, Net, Current, Beginning Balance Deferred Tax Assets, Net, Current, Ending Balance Assets, Current Total current assets Total current assets Assets, Noncurrent [Abstract] Long term assets: Equity Method Investments Fair value of VLI's non-voting EAM Trust investment at restructuring date Investment in EAM Trust Investment in EAM Trust Property, Plant and Equipment, Net Property and equipment, net Total property and equipment, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Capitalized Computer Software, Net Capitalized software and other intangible assets, net Assets, Noncurrent Total long term assets Total long term assets Total Assets EAM's total assets Total assets Liabilities and Equity [Abstract] Liabilities and Shareholders' Equity Liabilities, Current [Abstract] Current Liabilities: Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accrued Salaries, Current Accrued salaries Dividends Payable, Current Dividends payable Accrued Income Taxes, Current Accrued taxes on income Reserve For Settlement Expenses Including Fair Fund Reserve for settlement expenses Alternate concept name for the aggregate amount of Reserve for settlement expenses including fair fund as of the balance sheet date. Deferred Revenue, Current Unearned revenue Deferred Revenue, Current, Total Liabilities, Current Total current liabilities Total current liabilities Liabilities, Noncurrent [Abstract] Long term liabilities: Deferred Revenue, Noncurrent Unearned revenue Deferred Revenue, Noncurrent, Total Deferred Tax Liabilities, Noncurrent Deferred tax liability, long-term Deferred income taxes Liabilities, Noncurrent Total long term liabilities Total long term liabilities Total Liabilities EAM's total liabilities (1) Total liabilities Stockholders Equity Attributable To Parent [Abstract] Shareholders' Equity: Common Stock, Value, Issued Common stock, $0.10 par value; authorized 30,000,000 shares; issued 10,000,000 shares Additional Paid In Capital, Common Stock Additional paid-in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Retained Earnings (Accumulated Deficit) Retained earnings Retained earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Treasury Stock, Value Total average cost assigned Total Average Cost, Beginning Balance (in dollars) Total Average Cost, Ending Balance (in dollars) Treasury stock, at cost (107,059 and 103,619 shares, respectively) Accumulated Other Comprehensive Income (Loss), Net Of Tax Accumulated other comprehensive income, net of tax Accumulated other comprehensive income, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Stockholders Equity Attributable To Parent Balance Total shareholders' equity Balance Balance Liabilities and Equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Short-Term Investments Short term investments (in dollars) Short-term Investments, Total Allowance For Doubtful Accounts Receivable, Current Allowance for doubtful accounts (in dollars) Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for Doubtful Accounts Receivable, Current, Ending Balance Common Stock, Par Or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Treasury Stock, Shares Treasury stock, at cost (107,059 and 103,619 shares, respectively) Treasury stock, shares Balance (in shares) Balance (in shares) Income Statement [Abstract] Income Statement [Abstract] Revenue, Net [Abstract] Revenues: Subscription Revenue Investment periodicals and related publications Licenses Revenue Copyright data fees Revenue, Net Revenues from external customers Total revenues Total revenues Operating Expenses [Abstract] Expenses: Marketing and Advertising Expense Advertising and promotion Advertising and promotion Labor and Related Expense Salaries and employee benefits Salaries and employee benefits Other Selling and Marketing Expense Production and distribution Other General and Administrative Expense Office and administration Operating Expenses Total expenses Total expenses Operating Income (Loss) Segment profit from operations Income from operations Revenues and Profits Distribution From Unconsolidated Entity Revenues and profits interests in EAM Trust Revenues and profits interests in EAM Trust Revenues and profits interests in EAM Trust Represents the revenues and profits distribution from unconsolidated entity. Income From Securities Transactions, Net Income from securities transactions, net Income from securities transactions related to corporate assets Total income from securities transactions, net Income Tax Expense (Benefit) Deferred income taxes Income tax provision Income tax provision: Net Income Net income Net income Net income Earnings Per Share, Basic and Diluted Earnings per share, basic & fully diluted (in dollars per share) Earnings per share, basic & fully diluted Weighted Average Number Of Shares Outstanding, Basic and Diluted Weighted average number of common shares (in shares) Statement Of Other Comprehensive Income [Abstract] Statement of Other Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Net Of Tax [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Available-For-Sale Securities Adjustment, Net Of Tax, Portion Attributable To Parent Change in unrealized gains on securities, net of taxes Change in unrealized gains on securities, net of taxes Other comprehensive income (loss), available-for-sale securities adjustment, net of tax Other Comprehensive Income (Loss), Net Of Tax Other comprehensive income (loss) Other comprehensive income (loss) Comprehensive Income (Loss), Net Of Tax, Attributable To Parent Comprehensive income Comprehensive income Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By (Used In) Operating Activities [Abstract] Cash flows from operating activities: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities [Abstract] Adjustments to reconcile net income to net cash used by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Depreciation and amortization Non Voting Revenues Interest In Unconsolidated Entity Non-voting revenues interest in EAM Value Line's non-voting revenues interest Represents the income received against non voting revenues in unconsolidated entity. Non-voting revenues interest in EAM Trust Non Voting Profits Interest In Unconsolidated Entity Non-voting profits interest in EAM Non-voting profits interest Represents the income received against non voting profits in unconsolidated entity. Non-voting profits interest in EAM Trust Realized Losses On Securities Available-For- Sale (1) Realized losses on securities available-for-sale Realized losses on securities available-for-sale (1) Realized loss on sales of fixed income securities Realized loss on sales of fixed income securities Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred income taxes Deferred tax expense (benefit) Increase (Decrease) In Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) In Deferred Revenue Unearned revenue Increase (Decrease) In Reserve For Settlement Reserve for settlement The change in the reserve for settlement recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations. Increase (Decrease) In Operating Lease Exit Obligation Operating lease exit obligation The change in the operating lease exit obligation recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations. Increase (Decrease) In Accounts Payable and Accrued Liabilities Accounts payable & accrued expenses (Decrease) in accounts payable & accrued expenses Increase (Decrease) In Accrued Salaries Accrued salaries Increase (Decrease) In Accrued Taxes Payable Accrued taxes on income (Decrease) in accrued taxes payable Increase (Decrease) In Prepaid and Refundable Income Taxes Prepaid and refundable income taxes The increase (decrease) during the reporting period in the amount of payments made in advance and refundable for income taxes, which will be charged against earnings in future periods. Prepaid and refundable income taxes Increase (Decrease) In Prepaid Expense and Other Assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) In Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) In Due From Affiliates, Current Receivable from affiliates Receivable from affiliates Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities Total adjustments Total adjustments Net Cash Provided By (Used In) Operating Activities Net cash provided by operating activities Net cash used by operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Purchases Sales Of Securities Classified As Available For Sale [Abstract] Purchases/sales of securities classified as available-for-sale: Proceeds From Sale Of Available-For-Sale Securities, Debt Proceeds from maturities and sales of government debt securities Maturities and sales of fixed income securities Payments To Acquire Available-For-Sale Securities, Equity Purchases of equity securities Purchases of equity securities Distribution From Variable Entity, Investing Activities Distributions received from EAM Trust The cash inflow associated with the Profits or revenue distribution from variable entity. Payments To Acquire Property, Plant, and Equipment Acquisition of property and equipment Acquisition of property and equipment Payments For Software Expenditures for capitalized software Expenditures for capitalized software Net Cash Provided By (Used In) Investing Activities Net cash provided by investing activities Net cash (used) provided by investing activities Net Cash Provided By (Used In) Financing Activities [Abstract] Cash flows from financing activities: Payments For Repurchase Of Common Stock Purchase of treasury stock at cost Purchase of treasury stock at cost Payments Of Dividends, Common Stock Dividends paid Dividends paid Net Cash Provided By (Used In) Financing Activities Net cash used in financing activities Net cash used by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and cash equivalents Net change in cash and cash equivalents Statement Of Stockholders Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Statement, Equity Components [Axis] Common Stock [Member] Common stock Additional Paid-In Capital [Member] Additional paid-in capital Treasury Stock [Member] Treasury Stock Retained Earnings [Member] Retained earnings Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive income/(loss) Equity Component [Domain] Equity Component [Domain] Statement [Line Items] Statement [Line Items] Increase (Decrease) In Stockholders Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Balance (in shares) Treasury Stock, Value, Acquired, Cost Method Total average cost Purchases effected in open market (in dollars) Purchase of treasury stock Treasury Stock, Shares, Acquired Number of treasury shares Purchases effected in open market, shares Purchase of treasury stock (in shares) Dividends, Common Stock Dividends declared Dividends declared Dividends declared Common Stock, Dividends, Per Share, Declared Dividends declared per share (in dollars per share) Organization, Consolidation and Presentation Of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation Of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization and Summary of Significant Accounting Policies: Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Investments In Debt and Marketable Equity Securities (And Certain Trading Assets) Disclosure [Text Block] Investments: Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Text Block] Variable Interest Entity The entire disclosure for Categorization of Variable Interest Entities (VIE) for consolidation and (or) disclosure purposes, whether individually or in aggregate, by: (1) VIEs consolidated because the entity is the primary beneficiary, (2) VIEs not consolidated because the entity is not the primary beneficiary, and (3) VIEs or potential VIEs that are not consolidated because necessary information is not available. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Cash Flow, Supplemental Disclosures [Text Block] Supplementary Cash Flow Information: Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Compensation Related Costs, General [Text Block] Employees' Profit Sharing and Savings Plan: Comprehensive Income (Loss) Note [Abstract] Comprehensive Income (Loss) Note [Abstract] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income: Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions: Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Federal, State and Local Income Taxes: Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property and Equipment: Internal Use Software [Abstract] Internal Use Software [Abstract] Internal Use Software Disclosure [Text Block] Accounting for the Costs of Computer Software Developed for Internal Use: Disclosure of accounting policy for its computer software activities including the accounting treatment for costs incurred for (1) research and development activities, (2) development of computer software for internal use, (3) in-process research and development acquired in a purchase business combination. Treasury Stock [Abstract] Treasury Stock [Abstract] Treasury Stock [Text Block] Treasury Stock and Repurchase Program: Use Of Estimates, Policy [Policy Text Block] Use of Estimates: Consolidation, Policy [Policy Text Block] Principles of Consolidation: Revenue Recognition, Policy [Policy Text Block] Revenue Recognition: Equity Method Investments, Policy [Policy Text Block] Investment in Unconsolidated Entities: Fair Value Measurement, Policy [Policy Text Block] Valuation of Securities: Advertising Costs, Policy [Policy Text Block] Advertising expenses: Income Tax, Policy [Policy Text Block] Income Taxes: Earnings Per Share, Policy [Policy Text Block] Earnings per share: Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents: Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of fair value measurements of investments Schedule Of Available-For-Sale Securities Reconciliation [Table Text Block] Schedule of carrying value and fair value of securities available-for-sale Investment Income [Table Text Block] Schedule of income from securities transactions Investment Holdings, Other Than Securities [Table Text Block] Schedule of components of EAM's investment management operations Summary Investment Holdings [Table Text Block] Schedule of assets and liabilities Schedule Of Variable Interest Entities [Table Text Block] Schedule of total assets, the maximum exposure to loss, value of the assets and liabilities in EAM Schedule Of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of cash flow supplemental disclosures Schedule Of Comprehensive Income (Loss) [Table Text Block] Schedule of components of comprehensive income included in the consolidated condensed statements of income and changes in shareholders' equity Schedule Of Non Voting Revenues Interest and Non Voting Profits Interests [Policy Text Block] Schedule of non voting revenues interest and non voting profits interests Schedule of non voting revenues interest and non voting profits interests. Schedule Of Components Of Income Tax Expense (Benefit) [Table Text Block] Schedule of provision for income taxes Schedule Of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of components of deferred tax asset and deferred tax liability Schedule Of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of effective income tax rate reconciliation Property, Plant and Equipment [Table Text Block] Schedule of property and equipment Schedule Of Treasury Stock By Class [Table Text Block] Schedule of treasury stock, at cost Schedule Of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Equity Method Investee, Name [Axis] Equity Method Investee, Name [Axis] Equity Method Investee, Name [Domain] Equity Method Investee, Name [Domain] Equity Method Investee [Member] EAM Trust Schedule Of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] State and Local Income Tax Payments State and local income tax payments Amount represents State and local income tax payments. Federal Income Tax Payments To Parent Federal income tax payments to the parent Amount represents Federal income tax payments to the Parent. Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and Cash Equivalents, Fair Value Disclosure Cash equivalents Available-For-Sale Securities, Fair Value Disclosure Securities available-for-sale Fair value Fair Value Investments, Fair Value Disclosure Investments, Fair Value Disclosure Investments, fair value disclosure Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum Minimum [Member] Minimum Voting Profits Interest Of Unconsolidated Entity Percent each voting profits interest of EAM managed by trustees Amount represents voting profits interest of unconsolidated entity. Non Voting Revenues Interest Percent Non-voting revenues interest ("Revenues Interest") Represents percentage of non-voting revenues interest. Non Voting Profits Interest Percent Non-voting profits interest ("Profits Interest") Represents percentage of non-voting profits interest. Percentage Of Non Voting Profits Interests Due From Ex Subsidiary Payable To Parent Under Agreement Percentage of non voting profits interests due each quarter from EAM Represents the stated percentage of non voting profits interests due from ex-subsidiary payable to parent under agreement. Par Value Of Us Government Securities U.S. government securities (in dollar per share) Represents the par value of money market funds investement primarily in U.S. Government securities. Schedule Of Trading Securities and Other Trading Assets [Table] Schedule of Trading Securities and Other Trading Assets [Table] Major Types Of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types Of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Exchange Traded Funds [Member] ETFs - equities Inverse Exchange Traded Funds [Member] Inverse ETFs - equities Represents an exchange-traded fund (ETF) that is constructed by using various derivatives for the purpose of profiting from a decline in the value of an underlying benchmark. Schedule Of Available-For-Sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available-For-Sale Securities, Amortized Cost Basis, Total Aggregate cost of equity securities available for sale Cost Available-For-Sale Securities, Gross Unrealized Gains Gross Unrealized Gains Available-For-Sale Securities, Gross Unrealized Losses Gross Unrealized Losses Gross Unrealized Losses Investment Income, Net [Abstract] Investment Income, Net [Abstract] Dividend Income Dividend income Interest Income Interest income Investment Income, Other Other This item represents investment income derived from investments in debt and equity securities unless specified in taxonomy. Other Total Investment Management Fees Earned From Value Line Funds Total investment management fees earned from Value Line Funds Investment management fees earned from the Value Line Funds, net of waivers shown below Distribution and Service (12b-1) 12b-1 fees, net of waivers shown below Other Income Other income Investment Management Fee Waivers Investment management fee waivers (1) Represents the portion of revenue recognized on waiver of the investment management fees during the period. Fee Waiver On Distribution and Service12 B1 Fees 12b-1 fees waivers (1) Distribution and service fee waivers (12b-1) Represents the portion of revenue recognized on waiver of all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1. Total Equity EAM's total equity Equity Securities [Member] Equity Securities Us Government Debt Securities [Member] Government Debt Securities (Fixed Income Securities) Schedule Of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Other Comprehensive Income (Loss), Available-For-Sale Securities Adjustment, Before Tax, Portion Attributable To Parent Other comprehensive income (loss), available-for-sale securities adjustment, before tax, portion attributable to parent Other comprehensive income (loss), available-for-sale securities adjustment, before tax Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Expense Benefit Other comprehensive income unrealized holding gain loss on securities arising during period tax (expense) benefit Represents other comprehensive income unrealized holding gain loss on securities arising during period tax expense benefit. Deferred Taxes On Unrealized Gains On Securities Deferred taxes on unrealized gains on securities Represents the deferred tax on unrealized gains on securities. Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Eulav Asset Management Llc [Member] EAM Trust EULAV Asset Management LLC Represents the investment management operations of EULAV Asset Management LLC. Fair Value Of Contributed Capital At Inception Fair value of contributed capital at inception Represents the fair value of contributed capital at inception. Cash and Liquid Securities In Excess Of Working Capital Requirements Contributed To Capital Account Cash and liquid securities in excess of working capital requirements contributed to capital account Cash and Liquid Securities In Excess Of Working Capital Requirements Contributed To Capital Account Represents the cash and liquid securities in excess of working capital requirements contributed to capital account. Accrued Nonvoting Revenues and Profits Interests Payable to VLI for its accrued non-voting revenues and non-voting profits interests Represents the amount for accrued payable non-voting revenues and non-voting profits interests as of balance sheet date. Schedule Of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Primary Beneficiary [Member] EAM Trust EULAV Asset Management LLC Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Variable Interest Entity, Consolidated, Carrying Amount, Assets VIE Assets Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Liabilities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Maximum Exposure to Loss Percentage Of Noncontrolling Interest In Variable Interest Entity Non-voting profits interest in EAM Percentage of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, percentage of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest). Deferred Compensation Arrangement With Individual, Employer Contribution Estimated profit sharing plan contribution included in salaries and employee benefits Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Before Tax Change in unrealized gains on securities during the period, before tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Tax Change in unrealized gains on securities during the period, tax expense Change in unrealized gains on securities during the period, tax expense Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Tax Benefit Change in unrealized gains on securities during the period, tax benefit Represents the cash received from tax benefit of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities. Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Net Of Tax Change in unrealized gains on securities during the period, net of tax Change in unrealized gains on securities during the period, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment For Sale Of Securities Included In Net Income, Before Tax Add: Losses realized in net income, before tax Other Comprehensive Income (Loss), Reclassification Adjustment For Sale Of Securities Included In Net Income, Tax Adjustments for losses realized in net income, tax expense Add: Losses realized in net income, tax expense Other Comprehensive Income (Loss), Reclassification Adjustment For Sale Of Securities Included In Net Income, Tax Benefit Add: Losses realized in net income, tax benefit Represents the cash received from tax benefit of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities. Other Comprehensive Income (Loss), Reclassification Adjustment For Sale Of Securities Included In Net Income, Net Of Tax Adjustments for losses realized in net income, net of tax Add: Losses realized in net income, net of tax Other Comprehensive Income (Loss), Available-For-Sale Securities, Tax, Portion Attributable To Parent Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Expense Other comprehensive income (loss), available-for-sale securities, tax expense Other Comprehensive Income (Loss), Available For Sale Securities, Tax Benefit, Portion Attributable To Parent Other comprehensive income (loss), available-for-sale securities, tax benefit Represents the cash received from tax benefit of the appreciation (loss) in value of unsold available-for-sale securities attributable to the parent entity. Excludes amounts related to other than temporary impairment (OTTI) losses. Schedule Of Related Party Transactions, By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Value Line [Member] Value Line Inc Represents the company and its subsidiaries. Parent Company [Member] Arnold Bernhard and Co Inc Related Party Transaction [Line Items] Related Party Transaction [Line Items] Assets Under Management, Carrying Amount Total assets of value line funds managed by EAM Percentage Of Assets Decreased In Unconsolidated Entities Percentage of assets decreased in funds Represents the stated percentage of assets decreased in unconsolidated entities. Non Voting Profits Interest In Variable Entity Not Yet Paid Non voting profits interest in variable entity not yet paid Represents distributable amounts earned through the balance sheet date, which is included in the Investment in varible interest entity and not yet paid. Rental Accounting and Other Administrative Support Service Income Rental and accounting and other administrative support service income Represents an income received associated with rent and certain accounting and other administrative support services provided on a transitional basis during period. Reimbursement Revenue Reimbursed income Ownership Percentage By Parent Percentage of ownership of parent company The parent entity's interest in net assets of the subsidiary, expressed as a percentage. Income Tax Expense (Benefit) [Abstract] Income Tax Expense (Benefit) [Abstract] Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current tax expense (benefit): Current Federal Tax Expense (Benefit) Federal Current State and Local Tax Expense (Benefit) State and local Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current tax expense (benefit) Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred tax expense (benefit): Deferred Federal Income Tax Expense (Benefit) Federal Deferred State and Local Income Tax Expense (Benefit) State and local Deferred Tax Assets and Liabilities [Table] Deferred Tax Assets and Liabilities [Table] Represents the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Tax Benefit (Liability) Federal tax benefit (liability) State and Local Tax Liability (Benefit) State and local tax liability (benefit) Deferred Tax Assets and Liabilities [Line Items] Deferred Tax Assets and Liabilities [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Net Operating Loss Net operating loss Deferred Tax Liabilities, Unrealized Gains On Available For Sale Securities, Current Unrealized gains on securities held for sale Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on Available for Sale Securities, expected to be realized or consumed within one year or operating cycle, if longer. Unrealized gains on securities held for sale Deferred Tax Assets, Operating Lease Exit Obligation, Current Operating lease exit obligation Represents current potion of deferred tax assets operating lease exit obligation. Deferred Tax Assets, Deferred Professional Fees, Current Deferred professional fees Amount deferred tax asset attributable to deductible temporary differences from deferred professional fees, expected to be realized or consumed within one year or operating cycle, if longer. Deferred Tax Assets Deferred Charges Current Deferred charges Amount deferred tax asset attributable to deductible temporary differences from deferred charges, expected to be realized or consumed within one year or operating cycle, if longer. Deferred Tax Assets Other Current Other Amount of deferred tax asset attributable to deductible temporary differences not separately disclosed, expected to be realized or consumed within one year or operating cycle, if longer. Deferred Tax Liabilities Deferred Gain On Deconsolidation Of Subsidiary Noncurrent Gain from deconsolidation of the company's asset management and mutual fund distribution subsidiaries Deferred gain on deconsolidation of EAM Amount of deferred tax liability attributable to taxable temporary differences from deferred gain on deconsolidation of subsidiary, expected to be realized or consumed after one year (or the normal operating cycle, if longer). Deferred gain on deconsolidation of EAM Deferred Tax Assets Deferred Non Cash Postemployment Compensation Noncurrent Deferred non-cash postemployment compensation granted to VLI's former employee Deferred non-cash postemployment compensation Amount of deferred tax asset attributable to deductible temporary differences from deferred non-cash postemployment compensation, expected to be realized or consumed after one year (or the normal operating cycle, if longer). Deferred Tax (Assets) Liabilities, Depreciation and Amortization, Noncurrent Depreciation and amortization Amount of deferred tax (asset) liability attributable to deductible temporary differences from depreciation and amortization, expected to be realized or consumed after one year (or the normal operating cycle, if longer). Other Other Other Deferred Tax Assets, Deferred Professional Fees, Noncurrent Deferred professional fees Amount deferred tax asset attributable to deductible temporary differences from deferred professional fees, expected to be realized or consumed after one year (or the normal operating cycle, if longer). Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] U.S. Statutory Federal Rate U.S. statutory federal rate Increase (Decrease) In Tax Rate [Abstract] Increase (decrease) in tax rate from: State and Local Income Taxes, Net Of Federal Income Tax Benefit State and local income taxes, net of federal income tax benefit Effect Of Dividends Received Deductions Effect of dividends received deductions Income Tax Reconciliation Tax Credits Domestic Domestic production tax credit The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates during the period. Alternative Minimum Tax Benefit Net Operating Loss Limitation Alternative minimum tax benefit net operating loss limitation Represents percentages for alternative minimum tax benefit net operating loss limitation. Other, Net Other, net Effective Income Tax Rate, Continuing Operations Effective income tax rate Utilization Of Operating Loss Carryforwards Net operating loss carryforward The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, utilized to reduce taxable income under enacted tax laws. Land Land Buildings and Improvements, Gross Building and leasehold improvements Furniture and Equipment, Gross Furniture and equipment Gross amount, at the balance sheet date, of long-lived, depreciable assets commonly used in offices and stores. It also includes equipments. Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Property, plant and equipment, gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation and amortization Accumulated depreciation and amortization Schedule Of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Computer Software Developed For Internal Use Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Capitalized Computer Software, Additions Capitalized cost of development of software for internal use Capitalized Software Development Costs For Project Development costs for the digital production software project Represents the capitalized development cost for project during the period. Capitalized Software Development Costs For New Systems Development costs related to a new fulfillment system Represents the capitalized development cost for new system during the period. Finite-Lived Intangible Asset, Useful Life Expected useful life of the asset Capitalized Computer Software, Amortization Amortization expense Treasury Stock At Cost [Roll Forward] Treasury Stock At Cost [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Treasury Stock Acquired, Average Cost Per Share Average cost per share Stock Repurchase Program, Remaining Authorized Repurchase Amount Aggregate purchase price remaining under the program Class Of Treasury Stock [Table] Class of Treasury Stock [Table] Equity, Class Of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program, Authorized Amount Authorized repurchase amount of common stock Income (Loss) from Continuing Operations before Income Taxes, Domestic Income before income taxes Income before income taxes Income before income taxes