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, 2015	4,539,045
Balance at Aug. 31, 2015	$ 90,781	$ 13,441,264	$ 34,522,871	$ (3,180,811)	$ 3,019,702	$ 47,893,807
Repurchase of common stock (in shares)	(11,211)
Repurchase of common stock	$ (225)	(138,656)				(138,881)
Stock issued for employee stock purchase plan (in shares)	5,582
Stock issued for employee stock purchase plan	$ 112	68,522				68,634
Stock option expense		427,437				427,437
Dividend received by non-controlling interest					(200,000)	(200,000)
Comprehensive income (loss)			(867,514)	171,194	(278,729)	$ (975,049)
Stock options exercised (in shares)						0
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 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 (loss)			3,422,126	538,553	516,475	$ 4,477,154
Stock options exercised (in shares)	12,000					12,000
Stock options exercised	$ 240	122,759				$ 122,999
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