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Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
Cost of goods sold $ 6,499,102 $ 10,138,353 $ 24,991,487 $ 28,883,589
Direct Cost of Goods Sold [Member] | ZERUST [Member]        
Cost of goods sold $ 4,011,244 $ 5,725,220 $ 14,193,113 $ 16,596,536
Percent of product sales [1] 54.50% 56.80% 53.90% 56.70%
Direct Cost of Goods Sold [Member] | NaturTec [Member]        
Cost of goods sold $ 1,842,539 $ 3,670,282 $ 8,733,016 $ 10,181,050
Percent of product sales [1] 77.20% 76.20% 77.40% 78.00%
Indirect Cost of Goods Sold [Member]        
Cost of goods sold $ 645,319 $ 742,851 $ 2,065,358 $ 2,106,003
Percent of product sales [1]
[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.