Note 9 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Net income	$ 1,525,596	$ 1,000,167	$ 2,913,086	$ 5,676,773
Basic – weighted shares outstanding (in shares)	9,369,923	9,227,912	9,355,776	9,216,216
Weighted shares assumed upon exercise of stock options (in shares)	258,146	350,885	346,834	466,430
Diluted – weighted shares outstanding (in shares)	9,628,069	9,578,797	9,702,610	9,682,646
Basic net income per share: (in dollars per share)	$ 0.16	$ 0.11	$ 0.31	$ 0.62
Diluted net income per share: (in dollars per share)	$ 0.16	$ 0.11	$ 0.30	$ 0.59