Note 11 - Segment and Geographic Information - Net Sales by Geographic Location (Details) - USD ($)	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Net sales	$ 12,782,882	$ 13,233,783	$ 25,561,994	$ 27,865,183
Inside the USA to Unaffiliated Customers [Member]
Net sales	4,619,130	6,359,506	9,480,485	12,506,592
Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member]
Net sales	526,942	245,630	1,107,246	831,246
Unaffiliated Customers Outside the USA [Member]
Net sales	$ 7,636,810	$ 6,628,647	$ 14,974,262	$ 14,527,345