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Note 10 - Disclosure of Credit Risk of Financial Instruments with Off-balance Sheet Risk	12 Months Ended
	Apr. 30, 2021
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 2021, 2020 or 2019, and its accounts receivable as of April 30, 2021 or 2020.   During the twelve months ended April 30, 2021, 2020 and 2019, 31.6%, 31.4% and 20.5%, respectively, of total publishing revenues were derived from a single customer as explained in Note 16 - Concentration.

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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.

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