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Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment - USD ($)
 3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Direct cost of goods sold        
Cost of Goods Sold $ 5,595,207 $ 4,669,322 $ 15,059,558 $ 12,879,186
Direct Cost of Goods Sold [Member] | ZERUST [Member]        
Direct cost of goods sold        
Cost of Goods Sold $ 3,942,776 $ 3,288,809 $ 10,452,467 $ 9,336,363
% of Product Sales 55.70% [1] 54.90% [1] 54.70% 54.00%
Direct Cost of Goods Sold [Member] | Natur-Tec [Member]        
Direct cost of goods sold        
Cost of Goods Sold $ 889,976 $ 695,778 $ 2,391,599 $ 1,635,815
% of Product Sales 74.10% [1] 74.90% [1] 76.60% 76.00%
Indirect Cost of Goods Sold [Member]        
Direct cost of goods sold        
Cost of Goods Sold $ 762,455 $ 684,735 $ 2,215,492 $ 1,907,008
% 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.