Variable Interest Entity (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012		Apr. 30, 2012
Variable Interest Entity [Line Items]
Value Line Investment in EAM Trust (1)	$ 57,306	[1]	$ 56,331	[1]
Value Line Liabilities
Value Line Maximum Exposure to Loss	57,306		56,331
EULAV Asset Management LLC
Variable Interest Entity [Line Items]
VIE Assets	$ 58,838		$ 57,482

[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.