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Note 11 - Net Income Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 311,061 136,221 311,061 136,221