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Note 8 - Stockholders' Equity (Details Textual) - $ / shares			2 Months Ended	6 Months Ended
	Sep. 01, 2017	Sep. 01, 2016	Feb. 28, 2018	Feb. 28, 2018	Feb. 28, 2017	Jan. 15, 2018	Aug. 31, 2017
Stock Repurchased and Retired During Period, Shares				0	11,475
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
Stock Issued During Period, Shares, Employee Stock Purchase Plans	891	3,029
Common Stock, Shares Authorized			15,000,000	15,000,000		10,000,000	10,000,000
Common Stock, Additional Shares Authorized			5,000,000
Treasury Stock Acquired, Average Cost Per Share					$ 12.92
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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The additional number of common shares permitted to be issued by an entity's charter and bylaws.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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Number of shares issued during the period as a result of an employee stock purchase plan.

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