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Note 9 - Stockholders' Equity (Details Textual) - $ / shares	9 Months Ended
	May 31, 2017	May 31, 2016
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 10.25
Stock Repurchased and Retired During Period, Shares	14,525	7,511
Treasury Stock Acquired, Average Cost Per Share	$ 13.51	$ 12.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	4,000	0
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	56,677	53,447
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 13.40	$ 14.85

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Number of shares that have been repurchased and retired during the period.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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