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Note 4 - Investments - Components of EAM's Investment Management Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Investment periodicals and related publications $ 35,079 $ 37,487 $ 39,695
Non-voting revenues interest in EAM 16,183 11,900 10,397
EAM's net income (1) 20,686 19,016 18,069
EAM Trust [Member]      
Other income/(losses) 476 433 142
Investment management fee waivers and reimbursements 180 288 164
12b-1 fee waivers 90 94 105
Non-voting revenues interest in EAM 16,183 11,900 10,397
EAM's net income (1) [1] 4,270 2,764 1,468
EAM Trust [Member] | Investment Advice [Member]      
Investment periodicals and related publications 31,387 24,383 19,824
EAM Trust [Member] | Distribution and Shareholder Service [Member]      
Investment periodicals and related publications $ 7,788 $ 6,584 $ 5,964
[1] (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.