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] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents (including short term investments of $6,615 and $6,158, 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 $45 and $45, respectively Accounts receivable, net of allowance for doubtful accounts of $45 and $45, respectively Due From Affiliate, Current Receivable from affiliates 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, Current 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: Long-Term Investments Investment in EAM Trust Investment in EAM Trust Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Intangible Assets, Net (Excluding Goodwill) Capitalized software and other intangible assets, net Capitalized software and other intangible assets, net Assets, Noncurrent Total long term assets Total long term assets Assets 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 payable 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 income taxes Liabilities, Noncurrent Total long term liabilities Total long term liabilities Stockholders Equity, Including Portion Attributable To Noncontrolling Interest [Abstract] Shareholders' Equity: Common Stock, Value, Issued Common stock, $.10 par value; authorized 30,000,000 shares; issued 10,000,000 shares Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance 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 Treasury stock, at cost (36,819 shares on 7/31/11 and 25,119 shares on 4/30/11) Treasury Stock, Value, Beginning Balance Treasury Stock, Value, Ending Balance Treasury stock, at cost (36,819 shares on 7/31/11 and 25,119 shares on 4/30/11) 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, Including Portion Attributable To Noncontrolling Interest Total shareholders' equity 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 Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Income Statement [Abstract] Income Statement [Abstract] Revenues [Abstract] Revenues: Subscription Revenue Investment periodicals and related publications Licenses Revenue Copyright data fees Revenues Total revenues Total revenues Asset Management Fees Investment management fees & services 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) Income from operations Income from operations Revenues and Profits Distribution From Eam Trust Revenues and profits interests in EAM Trust The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from Revenues and profits distribution from EAM Trust. Revenues and profits interests in EAM Trust Investment Income, Net Income from securities transactions, net Income from securities transactions, net Income (Loss) From Continuing Operations Before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Income before income taxes Income Tax Expense (Benefit) Income tax provision Income tax provision Net Income (Loss), Including Portion Attributable To Noncontrolling Interest 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 Common Shares Weighted average number of common shares (in shares) Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding. Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) [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 provided by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Depreciation and amortization Amortization Of Debt Discount (Premium) Amortization of bond premium Revenues and Profits Interest In Eam Trust,Operating Activities Revenues and profits interests in EAM Trust The net amount Revenues and profits interest in EAM Trust, at a point in time. Revenues and profits interests in EAM Trust Available-For-Sale Securities, Gross Realized Gains Realized losses on sales of securities available for sale Realized losses on sales of securities available for sale Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Total Increase (Decrease) In Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) In Deferred Revenue (Decrease) in unearned revenue Increase (Decrease) In Reserve For Settlement (Decrease) in 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 (Decrease) in 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 (Decrease) in accounts payable & accrued expenses (Decrease) in accounts payable & accrued expenses Increase (Decrease) In Accrued Salaries (Decrease) in accrued salaries Increase (Decrease) In Prepaid and Refundable Income Taxes (Increase)/decrease in 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. (Increase)/decrease in prepaid and refundable income taxes Increase (Decrease) In Prepaid Expense and Other Assets (Increase)/decrease in prepaid expenses and other current assets (Increase)/decrease in prepaid expenses and other current assets (Increase)/decrease in prepaid expenses and other current assets Increase (Decrease) In Accounts Receivable Decrease in accounts receivable Decrease in accounts receivable Increase (Decrease) In Due From Affiliates, Current Decrease in receivable from affiliates Decrease in 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 (used in)/provided by operating activities Net cash (used in)/provided by operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Purchasessales Of Securities Classified As Available For Sale [Abstract] Purchases and sales of securities classified as available for sale: Proceeds From Sale Of Available-For-Sale Securities, Debt Proceeds from sales of fixed income securities Payments To Acquire Available-For-Sale Securities, Debt Purchase of fixed income securities Purchase of fixed income securities Revenues and Profits Distribution From Eam Trust, Investing Activities Revenues and profits distributions received from EAM Trust The cash inflow associated with the Revenues and profits distribution from EAM Trust. Payments To Acquire Property, Plant, and Equipment Acquisition of property and equipment Acquisition of property and equipment Acquisition of property and equipment Payments For Software Expenditures for capitalized software Expenditures for capitalized software Expenditures for capitalized software Net Cash Provided By (Used In) Investing Activities Net cash provided by /(used in) investing activities Net cash provided by /(used in) 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 in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase /(decrease) in cash and cash equivalents Net increase /(decrease) in cash and cash equivalents Statement Of Stockholders Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock Additional paid-in capital Treasury Stock Comprehensive income Retained earnings Accumulated Other Comprehensive income/(loss) Increase (Decrease) In Stockholders Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, Shares, Outstanding Balance (shares) Balance (shares) Balance (shares) Comprehensive Income (Loss), Net Of Tax, Including Portion Attributable To Noncontrolling Interest [Abstract] Comprehensive income Other Comprehensive Income (Loss), Net Of Tax [Abstract] Other comprehensive income/ (loss), net of tax: Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Net Of Tax Change in unrealized gains/ (losses) on securities, net of taxes Comprehensive Income (Loss), Net Of Tax, Including Portion Attributable To Noncontrolling Interest Comprehensive income Comprehensive income Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock Treasury Stock, Shares, Acquired Purchase (shares) Dividends, Common Stock Dividends declared Dividends declared 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: Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs, Share-Based Payments [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: Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Business Segments: Treasury Stock [Abstract] Treasury Stock [Abstract] Treasury Stock [Text Block] Treasury Stock and Repurchase Program: Legal Proceedings and Restructuring [Abstract] Legal Proceedings and Restructuring [Abstract] Legal Matters and Contingencies [Text Block] Legal Proceedings and Restructuring: Statement, Scenario [Axis] Class of Stock [Axis] Scenario, Unspecified [Domain] Class of Stock [Domain] Cash, Cash Equivalents, and Short-term Investments [Abstract] Cash and Cash Equivalents, at Carrying Value [Abstract] Short-term Investments [Abstract] Marketable Securities, Current [Abstract] Available-for-sale Securities, Current [Abstract] Receivables, Net, Current [Abstract] Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract] Accounts Receivable, Net, Current [Abstract] Prepaid Expense and Other Assets, Current [Abstract] Property, Plant and Equipment, Net [Abstract] Long-term Investments and Receivables, Net [Abstract] Long-term Investments [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Liabilities [Abstract] Accounts Payable and Accrued Liabilities, Current [Abstract] Taxes Payable, Current [Abstract] Deferred Revenue and Credits, Current [Abstract] Liabilities, Other than Long-term Debt, Noncurrent [Abstract] Deferred Revenue and Credits, Noncurrent [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Additional Paid in Capital [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Retained Earnings (Accumulated Deficit) [Abstract] Preferred Stock [Member] Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Income (Loss) from Operations before Extraordinary Items [Abstract] Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract] Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] Operating Income (Loss) [Abstract] Revenue, Net [Abstract] Costs and Expenses [Abstract] Selling, General and Administrative Expense [Abstract] Selling and Marketing Expense [Abstract] Marketing and Advertising Expense [Abstract]