Note 9 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Jan. 15, 2015
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	53,447	45,067
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 14.85	$ 20.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	38,333
Stock Repurchase Program, Authorized Amount			$ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,836,656
Stock Repurchased and Retired During Period, Shares	11,211
Treasury Stock Acquired, Average Cost Per Share	$ 12.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	53,447	45,067
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 14.85	$ 20.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 297,696