Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)		3 Months Ended
		Nov. 30, 2020	Nov. 30, 2019
Cost of goods sold		$ 8,313,321	$ 9,805,084
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 5,771,089	$ 5,543,354
Percent of product sales	[1]	56.50%	55.70%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 1,767,630	$ 3,614,419
Percent of product sales	[1]	69.10%	77.20%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 774,602	$ 647,311

[1] The percent of segment sales is calculated by dividing the direct cost of goods sold for each individual segment category by the net sales for each segment category.