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9. Cancellation of Capital Stock (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Nov. 30, 2014
May. 31, 2015
Aug. 31, 2015
Details          
Payments for Repurchase of Common Stock $ 54,491 $ 1,101,574 $ 1,292,477    
Average price per share repurchased and cancelled $ 11.41   $ 10.86 $ 12.37  
Cumulative Effect on Retained Earnings, before Tax $ 52,236   $ 1,236,340 $ 1,059,554  
Shares returned to treasury for cancellation 15,000        
Shares returned to treasury for cancellation, value         $ 7,077