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Note 10 - Disclosure of Credit Risk of Financial Instruments with Off-balance Sheet Risk | 12 Months Ended
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Apr. 30, 2020
Notes to Financial Statements |
Concentration Risk of Financial Instruments with Off-balance Sheet Risk [Text Block] | Note 10 - Disclosure of Credit Risk of Financial Instruments with Off-Balance Sheet Risk: Other than EAM and the Value Line Funds as explained in Note 3 - Related Party Transactions, a single customer accounted for a significant portion of the Company's sales in fiscal 2020, 2019 or 2018, and its accounts receivable as of April 30, 2020 or 2019. During the twelve months ended April 30, 2020, 2019 and 2018, 31.4%, 20.5% and 17.7%, respectively, of total publishing revenues were derived from a single customer as explained in Note 17 - Concentration.

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- Definition The entire disclosure for concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact related to financial instruments with off-balance sheet risk. + References No definition available. + Details
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