11. Cancellation of Capital Stock (Details) - USD ($)	3 Months Ended					9 Months Ended
	May 31, 2020	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	May 31, 2020
Details
Stock Repurchased and Retired During Period, Shares		46,408	195,142	8,450	95,671	490,120
Average price per share repurchased and cancelled	$ 7.89	$ 8.61	$ 8.73	$ 7.57	$ 9.34
Payments for Repurchase of Common Stock	$ 3,867,046	$ 399,593	$ 1,704,543	$ 63,929	$ 893,376
Decrease to retained earnings	$ 3,751,427	$ 388,645	$ 1,658,509	$ 61,936	$ 870,805
Stock Repurchased and Retired During Period, Shares		46,408	195,142	8,450	95,671	490,120
Stock Repurchased and Retired During Period, Shares		46,408	195,142	8,450	95,671	490,120