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Note 2 - Investments - Components of EAM's Investment Management Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Revenues $ 9,973 $ 10,210 $ 20,139 $ 20,538
Value Line’s non-voting revenues interest 4,263 3,729 8,412 7,009
EAM's net income 8,504 4,919 14,401 10,193
EAM Trust [Member]        
Other income 47 5 119 115
Investment management fee waivers and reimbursements 111 76 218 119
12b-1 fee waivers 171 165 342 322
Value Line’s non-voting revenues interest 4,263 3,729 8,412 7,009
EAM's net income [1] 1,258 970 2,570 1,698
EAM Trust [Member] | Investment Advice [Member]        
Revenues 7,922 7,181 15,679 13,491
EAM Trust [Member] | Distribution and Shareholder Service [Member]        
Revenues $ 2,487 $ 2,454 $ 4,941 $ 4,755
[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.