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Note 9 - Net Income (Loss) Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Net income $ 2,053,916 $ (965,221) $ 4,628,890 $ 427,163
Basic – weighted shares outstanding (in shares) 9,109,861 9,099,990 9,107,243 9,096,981
Weighted shares assumed upon exercise of stock options (in shares) 862,139 0 721,809 215,933
Diluted – weighted shares outstanding (in shares) 9,972,000 9,099,990 9,829,052 9,312,914
Basic net income (loss) per share: (in dollars per share) $ 0.23 $ (0.11) $ 0.51 $ 0.05
Diluted net income (loss) per share: (in dollars per share) $ 0.21 $ (0.11) $ 0.47 $ 0.05