Consolidated Statement of Stockholder's Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Apr. 30, 2013	$ 31,676	$ 6,550	$ 1,567	$ (305)	$ 31,191	$ (7,327)
Purchase of noncontrolling interest (Note B)	(1,874)				(1,874)
Net earnings	1,587				1,587
Other comprehensive income (loss)	(459)					(459)
Cash dividends declared, $0.10 per share	(260)				(260)
Stock options exercised, 13,500 shares	143		(7)	150
Stock options granted, 10,000 shares	59		59
Purchase of treasury stock, 6,598 shares	(86)			(86)
Ending Balance at Jul. 31, 2013	$ 30,786	$ 6,550	$ 1,619	$ (241)	$ 30,644	$ (7,786)