Note 11 - Segment and Geographic Information - Net Sales by Geographic Location (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Net sales	$ 9,744,823	$ 14,893,117	$ 37,610,006	$ 42,302,573
Inside the USA to Unaffiliated Customers [Member]
Net sales	5,019,363	6,172,882	19,546,708	19,564,756
Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member]
Net sales	673,751	1,112,313	1,504,997	2,304,455
Unaffiliated Customers Outside the USA [Member]
Net sales	$ 4,051,709	$ 7,607,922	$ 16,558,301	$ 20,433,362