2. SUMMARY - Earnings per share (Details) - USD ($)	3 Months Ended						6 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Feb. 29, 2020	Feb. 28, 2019
Numerator
Net income attributable to common shareholders	$ 2,150,080	$ 2,058,277	$ 2,059,227	$ 2,888,706	$ 2,099,449	$ 1,535,947	$ 4,208,357	$ 3,635,396
Denominator
Weighted-average number of common shares outstanding during the period	17,638,406				17,476,603		17,623,699	17,449,069
Dilutive effect of stock options	677,418				526,138		681,946	535,009
Common stock and common stock equivalents used for diluted earnings per share	18,315,824				18,002,741		18,305,645	17,984,078