Note 15 - Income Taxes - Reconciliations of the Expected Federal Income Tax at the Statutory Rate with the Provisions for Income Taxes (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Tax computed at statutory rates	$ 1,591,000	$ (195,000)
State income tax, net of federal benefit	53,000	20,000
Tax effect on equity in income of international joint ventures	(1,998,000)	(956,000)
Tax effect on dividends received from joint ventures and investment at carrying value	3,159,000	2,681,000
Tax effect of foreign operations	841,000	997,000
Foreign tax credit	(3,680,000)	(3,178,000)
Research and development credit	(212,000)	(408,000)
Valuation allowance	989,000	1,620,000
Stock based compensation	81,000	90,000
Non-controlling interest	(143,000)	(148,000)
Other	19,000	103,000
Total income tax expense	$ 699,519	$ 626,120