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Note 10 - Net Income (Loss) Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 275,791   275,791
Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 48,067 283,181 48,067