9. Cancellation of Capital Stock (Details) - USD ($)	3 Months Ended					12 Months Ended
	Aug. 31, 2016	May 31, 2016	Aug. 31, 2015	May 31, 2015	Nov. 30, 2014	Aug. 31, 2017
Details
Shares repurchased and cancelled, shares	112,152	63,386	4,778	89,051	118,969	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