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Note 9 - Net Income (Loss) Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   71,273    
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 136,221   136,221 633,176