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Note 8 - Stockholders' Equity (Details Textual) - $ / shares				3 Months Ended
	Nov. 20, 2017	Sep. 01, 2017	Sep. 01, 2016	Nov. 30, 2017	Nov. 30, 2016
Common Stock, Dividends, Per Share, Declared	$ 0.10			$ 0.10	$ 0
Stock Repurchased and Retired During Period, Shares				0	5,575
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				1,500	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price				$ 10.25
Treasury Stock Acquired, Average Cost Per Share					$ 12.87
Stock Issued During Period, Shares, Employee Stock Purchase Plans		891	3,029
Dividends Payable, Date to be Paid	Dec. 21, 2017
Dividends Payable, Date of Record	Dec. 08, 2017
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				47,252	56,677
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 18.35	$ 13.40

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Aggregate dividends declared during the period for each share of common stock outstanding.

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