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Note 11 - Geographic And Segment Information (Details) - Cost of Goods Sold By Segment (USD $)
 3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Direct cost of goods sold        
Cost of Goods Sold $ 4,054,364 $ 4,143,514 $ 11,379,249 $ 10,833,072
ZERUST [Member] | Direct Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold 3,115,980 3,046,644 8,383,345 8,074,031
% of Product Sales 57.50% [1] 42.20% [1] 56.20% [1] 49.70% [1]
Natur-Tec [Member] | Direct Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold 367,485 501,749 1,260,305 1,160,014
% of Product Sales 80.10% [1] 85.80% [1] 84.50% [1] 84.80% [1]
Indirect Cost of Goods Sold [Member]
        
Direct cost of goods sold        
Cost of Goods Sold $ 570,899 $ 595,121 $ 1,735,599 $ 1,599,027
% of Product Sales    [1]    [1]    [1]    [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.