Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)		3 Months Ended		9 Months Ended
		May 31, 2025	May 31, 2024	May 31, 2025	May 31, 2024
Cost of goods sold		$ 13,249,123	$ 12,793,103	$ 38,701,045	$ 38,143,878
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 9,119,330	$ 8,168,215	$ 25,894,213	$ 24,994,401
Cost of goods sold, percentage	[1]	58.00%	55.10%	57.10%	55.00%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 3,557,167	$ 3,768,921	$ 10,484,204	$ 10,566,223
Cost of goods sold, percentage	[1]	61.50%	64.40%	63.10%	65.00%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 572,626	$ 855,967	$ 2,322,628	$ 2,583,254

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