Note 10 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013	Jan. 15, 2015
2007 Plan [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 20.10	$ 14.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	45,067	56,373
Stock Repurchased and Retired During Period, Shares	1,587	0	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 20.10	$ 14.83	$ 10.25
Stock Repurchase Program, Authorized Amount				$ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,975,654
Treasury Stock Acquired, Average Cost Per Share	$ 15.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 297,696	$ 890,955	$ 45,533
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	45,067	56,373	118,294