Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Summary of share-based compensation activity
Shares Available for Grant, Beginning of year	302,756	245,253
Shares Outstanding, Beginning of year	73,521	131,024
Weighted Average Exercise Price, Beginning of year	$ 10.80	$ 9.43
Shares Available For Grant, Granted
Shares Outstanding, Granted
Weighted Average Exercise Price, Granted
Shares Available For Grant, Exercised
Shares Outstanding, Exercised
Weighted Average Exercise Price, Exercised
Shares Available For Grant, Cancelled	4,588	57,503
Shares Outstanding, Cancelled	(4,588)	(57,503)
Weighted Average Exercise Price, Cancelled	$ 5.03	$ 7.46
Shares Available for Grant, End of year	307,344	302,756
Shares Outstanding, End of year	68,933	73,521
Weighted Average Exercise Price, End of year	$ 11.19	$ 10.80