Note 13 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)		3 Months Ended		9 Months Ended
		May 31, 2022	May 31, 2021	May 31, 2022		May 31, 2021
Cost of goods sold		$ 12,722,833	$ 10,152,582	$ 36,977,620	[1]	$ 26,997,582	[1]
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 8,409,392	$ 7,091,220	$ 25,267,333	[1]	$ 18,928,272	[1]
Percent of product sales	[1]	58.20%	57.30%	60.20%		57.60%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 3,432,152	$ 2,251,996	$ 9,129,686	[1]	$ 5,703,807	[1]
Percent of product sales	[1]	76.00%	74.10%	76.60%		70.40%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 881,289	$ 809,366	$ 2,580,601	[1]	$ 2,365,503	[1]

[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.