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Investments - Components of EAM's investment management operations (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Schedule of Investments [Line Items]    
Value Line's non-voting revenues interest $ 1,902 $ 1,833
EAM's net income 2,119 2,036
EAM Trust    
Schedule of Investments [Line Items]    
Investment management fees earned from the Value Line Funds, net of fee waivers 3,838 3,787
12b-1 fees and other fees, net of fee waivers 1,396 1,360
Other income / (loss) (9) 5
Investment management fee waivers [1] 47 28
12b-1 fee waivers [1] 371 395
Value Line's non-voting revenues interest 1,902 1,833
EAM's net income [2] $ 280 $ 378
[1] During fiscal 2016 and 2015, investment management fee waivers primarily related to the Value Line Core Bond Fund and the 12b-1 fee waivers related to six of the Value Line Mutual Funds.
[2] 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.