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Note 12 - Geographic and Segment Information - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Cost of goods sold $ 6,612,766 $ 4,875,423
Percentage of product sales
Direct Cost of Goods Sold [Member] | ZERUST [Member]    
Cost of goods sold $ 4,699,537 $ 3,364,555
Percentage of product sales [1] 58.10% 56.30%
Direct Cost of Goods Sold [Member] | NaturTec [Member]    
Cost of goods sold $ 1,213,168 $ 834,259
Percentage of product sales [1] 75.00% 79.70%
Indirect Cost of Goods Sold [Member]    
Cost of goods sold $ 700,061 $ 676,609
[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.