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Note 11 - Geographic And Segment Information (Detail) - Cost of Goods Sold By Segment: (USD $)
 3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Direct cost of goods sold        
Cost of Goods Sold $ 3,633,913 $ 3,480,082 $ 7,324,885 $ 6,689,558
ZERUST [Member] | Direct Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold 2,623,070 2,569,588 5,267,365 5,027,387
% of Product Sales 55.70% [1] 56.20% [1] 55.40% [1] 55.70% [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold 453,147 361,704 892,820 658,265
% of Product Sales 84.60% [1] 89.60% [1] 86.50% [1] 84.10% [1]
Indirect Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold $ 557,696 $ 548,790 $ 1,164,700 $ 1,003,906
[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.