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Note 9 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Jan. 15, 2015
Stock Repurchase Program, Authorized Amount			$ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,640,548
Stock Repurchased and Retired During Period, Shares	14,525
Treasury Stock Acquired, Average Cost Per Share	$ 13.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	12,000	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 10.25	$ 0
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
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

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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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