2. SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings per share) - USD ($)	3 Months Ended							9 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	May 31, 2019	May 31, 2018
Numerator
Net income attributable to common shareholders	$ 2,888,706	$ 2,099,449	$ 1,535,947	$ 1,337,982	$ 2,406,037	$ 3,474,787	$ 1,716,006	$ 6,524,102	$ 7,596,828
Denominator
Weighted-average number of common shares outstanding during the period	17,519,849				17,339,937			17,472,922	17,308,414
Dilutive effect of stock options	576,346				564,491			535,414	541,757
Common stock and common stock equivalents used for diluted earnings per share	18,096,195				17,904,428			18,008,336	17,850,171