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Note 4 - Investments - Components of EAM's Investment Management Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Revenues $ 39,695 $ 40,525 $ 40,392
Non-voting revenues interest in EAM 10,397 15,899 15,190
EAM's net income 18,069 23,822 23,280
EAM Trust [Member]      
Other income/(losses) 142 (20) 361
Investment management fee waivers and reimbursements 164 547 121
12b-1 fee waivers 105 644 651
Non-voting revenues interest in EAM 10,397 15,899 15,190
EAM's net income [1] 1,468 4,284 4,262
EAM Trust [Member] | Investment Advice [Member]      
Revenues 19,824 29,598 29,022
EAM Trust [Member] | Distribution and Shareholder Service [Member]      
Revenues $ 5,964 $ 9,310 $ 9,604
[1] Represents EAM's net income, after giving effect to Value Line’s non-voting revenues interest, but before distributions to voting profits interest holders and to the Company in respect of its 50% non-voting profits interest.