Note 11 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Net income	$ 1,000,167	$ 2,053,916	$ 5,676,773	$ 4,628,890
Basic – weighted shares outstanding (in shares)	9,227,912	9,109,861	9,216,216	9,107,243
Weighted shares assumed upon exercise of stock options (in shares)	350,886	862,139	466,430	721,809
Diluted – weighted shares outstanding (in shares)	9,578,797	9,972,000	9,682,646	9,829,052
Basic net income per share: (in dollars per share)	$ 0.11	$ 0.23	$ 0.62	$ 0.51
Diluted net income per share: (in dollars per share)	$ 0.11	$ 0.21	$ 0.59	$ 0.47