CONSOLIDATED STATEMENTS OF STOCKHOLDERS' 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, 2011	$ 31,491	$ 6,550	$ 1,091	$ (438)	$ 29,218	$ (4,930)
Net earnings	1,031				1,031
Other comprehensive income (loss)	(2,246)					(2,246)
Cash dividends declared	(1,031)				(1,031)
Stock options exercised	141		(11)	152
Stock based compensation	261		261
Purchase of treasury stock	(136)			(136)
Ending Balance at Apr. 30, 2012	29,511	6,550	1,341	(422)	29,218	(7,176)
Net earnings	3,044				3,044
Other comprehensive income (loss)	(151)					(151)
Cash dividends declared	(1,071)				(1,071)
Stock options exercised	285		(1)	286
Stock based compensation	227		227
Purchase of treasury stock	(169)			(169)
Ending Balance at Apr. 30, 2013	31,676	6,550	1,567	(305)	31,191	(7,327)
Purchase of noncontrolling interest (Note 10)	(1,874)				(1,874)
Net earnings	3,895				3,895
Other comprehensive income (loss)	1,054					1,054
Cash dividends declared	(1,122)				(1,122)
Stock options exercised	1,249	7	(163)	1,405
Stock based compensation	238		238
Purchase of treasury stock	(1,157)			(1,157)
Ending Balance at Apr. 30, 2014	$ 33,959	$ 6,557	$ 1,642	$ (57)	$ 32,090	$ (6,273)