Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)		3 Months Ended		6 Months Ended
		Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021		Feb. 29, 2020
Cost of goods sold		$ 8,531,679	$ 8,687,301	$ 16,845,000		$ 18,492,385
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 6,065,963	$ 4,638,514	$ 11,837,052	[1]	$ 10,081,686	[1]
Percent of product sales	[1]	59.00%	51.40%	57.70%		53.70%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 1,684,180	$ 3,276,058	$ 3,451,810	[1]	$ 6,890,477	[1]
Percent of product sales	[1]	67.40%	77.70%	68.30%		77.40%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 781,536	$ 772,729

[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.