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9. Cancellation of Capital Stock (Details) - USD ($)
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Details    
Shares repurchased and cancelled, shares 154,329 83,600
Payments for Repurchase of Common Stock $ 1,271,599 $ 526,941
Average price per share repurchased and cancelled $ 8.24 $ 6.30
Decrease to retained earnings $ 1,235,191 $ 507,217
Shares returned to treasury for cancellation   20,000
Shares returned to treasury for cancellation, value   $ 4,719
Shares returned to treasury for cancellation, value, effect on retained earnings   $ 4,719