Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2010	$ 38	$ 10,961	$ (1,032)	$ 9,967
Balance (in Shares) at Apr. 30, 2010	3,788
Net income			872	872
Exercise of stock options		2		2
Exercise of stock options (in Shares)	1
Share-based compensation expense		36		36
Balance at Apr. 30, 2011	38	10,999	(160)	10,877
Balance (in Shares) at Apr. 30, 2011	3,789
Net income			1,219	1,219
Exercise of stock options	1	76		77
Exercise of stock options (in Shares)	95
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