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10. Cancellation of Capital Stock (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 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

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