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Note 13 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Cost of goods sold $ 12,490,483 $ 8,313,321
Direct Cost of Goods Sold [Member] | ZERUST [Member]    
Cost of goods sold $ 8,706,667 $ 5,771,089
Percent of product sales [1] 60.40% 56.50%
Direct Cost of Goods Sold [Member] | NaturTec [Member]    
Cost of goods sold $ 2,922,098 $ 1,767,630
Percent of product sales [1] 77.50% 69.10%
Indirect Cost of Goods Sold [Member]    
Cost of goods sold $ 861,718 $ 774,602
[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.