Note 15 - Income Taxes - Tax Effect of the Temporary Differences and Tax Carry Forwards Comprising Net Deferred Taxes (Details) - USD ($)	Aug. 31, 2017	Aug. 31, 2016
Accrued compensation	$ 310,300	$ 150,600
Inventory costs	87,000	95,300
Accrued joint venture expenses	15,200	54,200
Other accrued expenses	74,000	87,000
Goodwill and other intangible assets	1,317,700	1,332,000
Stock-based compensation	241,600	210,600
Foreign tax credit carryforward	6,105,700	5,679,000
Other credit and loss carryforwards	3,473,100	3,214,300
Total deferred tax assets	11,624,600	10,823,000
Valuation allowance	(9,578,700)	(8,893,300)
Total deferred tax assets after valuation allowance	2,045,900	1,929,700
Property and equipment	(206,000)	(215,600)
Other	(83,300)	(74,300)
Total deferred tax liabilities	(289,300)	(289,900)
Net deferred tax assets	$ 1,756,600	$ 1,639,800