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Note 12 - Geographic And Segment Information (Detail) - Cost of Goods Sold By Segment: (USD $)
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Direct cost of goods sold    
Cost of Goods Sold $ 14,528,785 $ 12,768,640
% of Product Sales 63.80% 65.40%
ZERUST [Member] | Direct Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Cost of Goods Sold 10,748,865 10,087,637
% of Product Sales 51.30% 54.40%
Natur-Tec [Member] | Direct Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Cost of Goods Sold 1,585,731 702,608
% of Product Sales 87.60% 71.40%
Indirect Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Cost of Goods Sold $ 2,194,190 $ 1,978,395