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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, 2017
Notes to Financial Statements |
Concentration Risk Disclosure [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, no single customer accounted for a significant portion of the Company's sales in fiscal 2017, 2016 or 2015, nor its accounts receivable as of April 30, 2017 or 2016.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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- References No definition available. + Details
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