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Note 9 - Net Income (Loss) Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Net income (loss) attributable to NTIC $ 6,281,238 $ (1,337,709)
Basic-weighted shares outstanding (in shares) 9,116,472 9,096,981
Weighted shares assumed upon exercise of stock options (in shares) 757,667 0
Diluted – weighted shares outstanding (in shares) 9,874,139 9,096,981
Basic net income (loss) per share: (in dollars per share) $ 0.69 $ (0.15)
Diluted net income (loss) per share: (in dollars per share) $ 0.64 $ (0.15)