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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, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Revenues $ 9,051 $ 8,989 $ 18,022 $ 17,903
Value Line’s non-voting revenues interest 2,095 2,039 4,063 4,017
EAM's net income (1) 3,302 2,072 6,406 4,287
EAM Trust [Member]        
Other income (27) 49 44 104
Investment management fee waivers 110 107 221 261
12b-1 fee waivers 175 179 334 414
Value Line’s non-voting revenues interest 2,095 2,039 4,063 4,017
EAM's net income (1) [1] 578 396 1,184 712
EAM Trust [Member] | Investment Advice [Member]        
Revenues 4,181 4,068 8,290 8,026
EAM Trust [Member] | Distribution and Shareholder Service [Member]        
Revenues $ 1,727 $ 1,619 $ 3,431 $ 3,168
[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.