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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.

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