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Note 4 - Investments - Schedule of Components of EAM's Investment Management Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Non-voting revenues interest in EAM $ 7,195 $ 7,211 $ 7,346
EAM's net income (2) 10,367 7,291 7,292
EAM Trust [Member]      
Investment management fees earned from the Value Line Funds, net of waivers shown below 14,701 14,548 15,014
12b-1 fees and other fees, net of waivers shown below 5,822 5,669 5,459
Other income/(loss) 205 (14) 34
Investment management fee waivers and reimbursements (1) [1] 436 262 192
12b-1 fee waivers (1) [1] 923 1,071 1,518
Non-voting revenues interest in EAM 7,195 7,211 7,346
EAM's net income (2) [2] $ 1,038 $ 880 $ 1,248
[1] During fiscal 2017, 2016 and 2015 investment management fee waivers and reimbursements primarily related to one Value Line Mutual Fund and the 12b-1 fee waivers related to four 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.