Consolidated Statements of Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Aug. 31, 2016	4,533,416
Balance at Aug. 31, 2016	$ 90,668	$ 13,798,567	$ 33,655,357	$ (3,009,617)	$ 2,540,973	$ 47,075,948
Repurchase of common stock (in shares)	(14,525)					(14,525)
Repurchase of common stock	$ (291)	(195,934)				$ (196,225)
Stock options exercised (in shares)	12,000					12,000
Stock options exercised	$ 240	122,759				$ 122,999
Stock issued for employee stock purchase plan (in shares)	4,127
Stock issued for employee stock purchase plan	$ 83	46,453				46,536
Stock option expense		391,664				391,664
Dividend received by non-controlling interest					(200,000)	(200,000)
Comprehensive income			3,422,126	538,553	516,475	4,477,154
Balance (in shares) at Aug. 31, 2017	4,535,018
Balance at Aug. 31, 2017	$ 90,700	14,163,509	37,077,483	(2,471,064)	2,857,448	$ 51,718,076
Repurchase of common stock (in shares)						0
Stock options exercised (in shares)	4,410					4,410
Stock options exercised	$ 88	15,345				$ 15,433
Stock issued for employee stock purchase plan (in shares)	1,875
Stock issued for employee stock purchase plan	$ 38	27,913				27,951
Stock option expense		413,010				413,010
Dividend received by non-controlling interest					(600,000)	(600,000)
Comprehensive income			6,701,366	(1,126,135)	484,861	6,060,092
Dividends paid to shareholders			(1,815,508)			(1,815,508)
Balance (in shares) at Aug. 31, 2018	4,541,303
Balance at Aug. 31, 2018	$ 90,826	$ 14,619,777	$ 41,963,341	$ (3,597,199)	$ 2,742,309	$ 55,819,054