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 April 30, 2011 at Apr. 30, 2011	$ 38	$ 10,999		$ (160)	$ 10,877
Balance at April 30, 2011 (in Shares) at Apr. 30, 2011	3,789,000
Net income (loss)				1,219	1,219
Exercise of stock options	1	76			77
Exercise of stock options (in Shares)	95,000
Share-based compensation expense		91			91
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)				968	968
Exercise of stock options		59			59
Exercise of stock options (in Shares)	47,000				47,500
Issue of restricted stock (in Shares)	3,000
Stock repurchases			(140)		(140)
Stock repurchases (in Shares)	(34,000)
Share-based compensation expense		89			89
Balance at Jan. 31, 2013	$ 39	$ 11,314	$ (140)	$ 2,027	$ 13,240
Balance (in Shares) at Jan. 31, 2013	3,900,000