Note 2 - Schedule of Components of EAM's Investment Management Operations (Details) - USD ($)		3 Months Ended
		Jul. 31, 2016	Jul. 31, 2015
EAM Trust [Member]
Investment management fees earned from the Value Line Funds, net of fee waivers		$ 3,637	$ 3,838
12b-1 fees and other fees, net of fee waivers		1,443	1,396
Other income (loss)		63,000	(9)
Investment management fee waivers (1)	[1]	81	47
12b-1 fee waivers (1)	[1]	233,000	371,000
Value Line’s non-voting revenues interest		1,787,000	1,902,000
EAM's net income (2)	[2]	258,000	280,000
Value Line’s non-voting revenues interest		1,787,000	1,902,000
EAM's net income (2)		$ 6,358,000	$ 2,119,000

[1] During fiscal 2017 and 2016 investment management fee waivers primarily related to the Value Line Core Bond Fund and the 12b-1 fee waivers related to four 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.