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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.

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