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Note 9 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Net income $ 411,497 $ 182,847 $ 913,739 $ 4,676,606
Basic – weighted shares outstanding (in shares) 9,366,357 9,214,817 9,353,989 9,211,858
Weighted shares assumed upon exercise of stock options (in shares) 381,104 468,609 391,177 524,202
Diluted – weighted shares outstanding (in shares) 9,747,461 9,683,426 9,745,166 9,736,060
Basic net income per share: (in dollars per share) $ 0.04 $ 0.02 $ 0.1 $ 0.51
Diluted net income per share: (in dollars per share) $ 0.04 $ 0.02 $ 0.09 $ 0.48