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Investments - Components of EAM's investment management operations (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Schedule of Investments [Line Items]        
Value Line's non-voting revenues interest $ 1,803 $ 1,663 $ 3,636 $ 3,261
EAM's net income 1,982 1,616 4,018 3,061
EAM Trust
        
Schedule of Investments [Line Items]        
Investment management fees earned from the Value Line Funds, net of fee waivers 3,690 3,580 7,477 7,065
12b-1 fees and other fees, net of fee waivers 1,349 1,294 2,709 2,413
Other income 4 8 9 10
Investment management fee waivers 41 [1] 23 [1] 69 [1] 47 [1]
12b-1 fee waivers 374 [1] 379 [1] 769 [1] 902 [1]
Value Line's non-voting revenues interest 1,803 1,663 3,636 3,261
EAM's net income $ 292 [2] $ 382 [2] $ 670 [2] $ 724 [2]
[1] During fiscal 2015 and 2014, investment management fee waivers related to one of the Value Line Mutual Fixed Income Funds. During fiscal 2015 and 2014, the 12b-1 fee waivers related to six and seven of the Value Line Mutual Funds, respectively.
[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.