Note 9 - Net Income Per Common Share - Reconciliation of the Earnings Per Share Computations (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Net income	$ (965,221)	$ 1,482,149	$ 427,163	$ 4,380,776
Basic – weighted shares outstanding (in shares)	9,099,990	9,084,354	9,096,981	9,085,584
Weighted shares assumed upon exercise of stock options (in shares)		308,090	215,933	355,274
Diluted – weighted shares outstanding (in shares)	9,099,990	9,392,444	9,312,914	9,440,858
Basic net income per share: (in dollars per share)	$ (0.11)	$ 0.16	$ 0.05	$ 0.48
Diluted net income per share: (in dollars per share)	$ (0.11)	$ 0.16	$ 0.05	$ 0.46