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9. Cancellation of Capital Stock (Details) - USD ($)	3 Months Ended						9 Months Ended	12 Months Ended
9. Cancellation of Capital Stock (Details) - USD ($)	Aug. 31, 2015	May. 31, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	Aug. 31, 2015
Details
Payments for Repurchase of Common Stock	$ 54,491	$ 1,101,574	$ 1,292,477	$ 454,050	$ 3,234,699	$ 569,019
Average price per share repurchased and cancelled	$ 11.41		$ 10.86	$ 10.08	$ 9.89	$ 9.78	$ 12.37
Cumulative Effect on Retained Earnings, before Tax	$ 52,236		$ 1,236,340	$ 432,794	$ 3,080,365	$ 541,564	$ 1,059,554
Shares returned to treasury for cancellation	15,000
Shares returned to treasury for cancellation, value								$ 7,077