Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Other Comprehensive Income (Loss) [Member]	Total
Balance at Jul. 31, 2009	$ 24	$ 24,520	$ 13,586	$ 0	$ 38,130
Balance (in shares) at Jul. 31, 2009	24,454,256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	5,733	0	5,733
Foreign currency translation adjustment				(23)	(23)
Total comprehensive income	0	0	0	0	5,710
Restricted stock grants	1	114	0	0	115
Restricted stock grants (in shares)	174,885
Stock-based compensation	0	172	0	0	172
Stock-based compensation (in shares)	79,244
Proceeds from stock options exercised	0	68	0	0	68
Proceeds from stock options exercised (in shares)	63,770
Tax benefit associated with stock options exercised	0	31	0	0	31
Balance at Jul. 31, 2010	25	24,905	19,319	(23)	44,226
Balance (in shares) at Jul. 31, 2010	24,772,155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	5,633	0	5,633
Foreign currency translation adjustment	0	0	0	112	112
Total comprehensive income	0	0	0	0	5,745
Restricted stock grants	0	153	0	0	153
Restricted stock grants (in shares)	43,846
Stock-based compensation	0	205	0	0	205
Stock-based compensation (in shares)	13,466
Proceeds from stock options exercised	0	210	0	0	210
Proceeds from stock options exercised (in shares)	141,417
Tax benefit associated with stock options exercised	0	125	0	0	125
Balance at Jul. 31, 2011	25	25,598	24,952	89	50,664
Balance (in shares) at Jul. 31, 2011	24,970,884
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	5,586	0	5,586
Foreign currency translation adjustment	0	0	0	(595)	(595)
Total comprehensive income	0	0	0	0	4,991
Restricted stock grants	0	336	0	0	336
Restricted stock grants (in shares)	166,707
Stock-based compensation	0	428	0	0	428
Stock-based compensation (in shares)	5,593
Proceeds from stock options exercised	0	35	0	0	35
Proceeds from stock options exercised (in shares)	16,885
Tax benefit associated with stock options exercised	0	24	0	0	24
Balance at Jul. 31, 2012	$ 25	$ 26,421	$ 30,538	$ (506)	$ 56,478
Balance (in shares) at Jul. 31, 2012	25,160,069