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9. Cancellation of Capital Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2016
May 31, 2016
Aug. 31, 2017
Details      
Shares repurchased and cancelled, shares 112,152 63,386 41,800
Payments for Repurchase of Common Stock $ 1,378,701 $ 745,878 $ 526,941
Average price per share repurchased and cancelled $ 12.29 $ 11.77 $ 12.61
Cumulative Effect on Retained Earnings, before Tax $ 1,325,994   $ 507,217
Shares returned to treasury for cancellation 15,000   10,000
Shares returned to treasury for cancellation, value $ 7,124   $ 4,719
Shares returned to treasury for cancellation, value, effect on retained earnings $ 7,124 $ 715,756 $ 4,719