Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2012	$ 39	$ 11,166		$ 1,059	$ 12,264
Balance (in Shares) at Apr. 30, 2012	3,884,000
Net income (loss)				1,683	1,683
Exercise of stock options	1	152			1,539
Exercise of stock options (in Shares)	70,000
Issue of restricted stock (in Shares)	3,000
Stock repurchases			(282)		(282)
Stock repurchases (in Shares)	(59,000)
Share-based compensation expense		111			111
Balance at Apr. 30, 2013	40	11,429	(282)	2,742	13,929
Balance (in Shares) at Apr. 30, 2013	3,898,000
Net income (loss)				264	264
Exercise of stock options		13			13
Exercise of stock options (in Shares)	3,000				3,333
Issue of restricted stock (in Shares)	4,000
Stock repurchases			(92)		(92)
Stock repurchases (in Shares)	(16,000)
Share-based compensation expense		46			46
Balance at Jul. 31, 2013	$ 40	$ 11,488	$ (374)	$ 3,006	$ 14,160
Balance (in Shares) at Jul. 31, 2013	3,889,000