Note 11 - Stock-Based Compensation (Detail) - Stock Option Activity: (USD $)	12 Months Ended
Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Number of Shares, Outstanding	203,873	189,839	232,472
Weighted Average Exercise Price, Outstanding (in Dollars per share)	$ 10.01	$ 9.07	$ 8.42
Aggregate Intrinsic Value, Outstanding (in Dollars)	$ 266,332
Exercisable at August 31, 2012	166,753
Exercisable at August 31, 2012 (in Dollars per share)	$ 10.42
Exercisable at August 31, 2012 (in Dollars)	$ 190,095
Number of Shares, Granted	26,000	30,000
Weighted Average Exercise Price, Granted (in Dollars per share)	$ 16.45	$ 9.76
Number of Shares, Exercised	3,966	(66,633)
Weighted Average Exercise Price, Exercised (in Dollars per share)	$ 8.71	$ 6.97
Number of Shares, Terminated	(8,000)	(6,000)
Weighted Average Exercise Price, Terminated (in Dollars per share)	$ 9.23	$ 8.83

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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