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Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Cost of goods sold $ 12,276,482 $ 12,503,374 $ 25,451,922 $ 25,350,775
Direct Cost of Goods Sold [Member] | ZERUST [Member]        
Cost of goods sold $ 8,096,177 $ 8,082,163 $ 16,774,883 $ 16,826,187
Cost of goods sold, percentage [1] 57.40% 53.10% 56.70% 54.90%
Direct Cost of Goods Sold [Member] | NaturTec [Member]        
Cost of goods sold $ 3,237,854 $ 3,568,719 $ 6,927,037 $ 6,797,302
Cost of goods sold, percentage [1] 65.30% 63.50% 64.00% 65.40%
Indirect Cost of Goods Sold [Member]        
Cost of goods sold $ 942,451 $ 852,492 $ 1,750,002 $ 1,727,286
[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.