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Note 2 - Investments - Components of EAM's Investment Management Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Revenues $ 9,617 $ 8,971
Value Line’s non-voting revenues interest 2,588 1,968
EAM's net income (1) 3,690 3,104
EAM Trust [Member]    
Other income 53 71
Investment management fee waivers and reimbursements 109 111
12b-1 fee waivers 173 159
Value Line’s non-voting revenues interest 2,588 1,968
EAM's net income (1) [1] 566 606
EAM Trust [Member] | Investment Advice [Member]    
Revenues 5,147 4,109
EAM Trust [Member] | Distribution and Shareholder Service [Member]    
Revenues $ 1,979 $ 1,704
[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.