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Note 11 - Geographic And Segment Information (Detail) - Cost of Goods Sold By Segment: (USD $)
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Direct cost of goods sold    
Cost of Goods Sold $ 3,690,972 $ 3,209,476
Direct Cost of Goods Sold [Member] | ZERUST [Member]
    
Direct cost of goods sold    
Cost of Goods Sold 2,644,295 2,457,799
% of Product Sales 55.10% 55.20%
Direct Cost of Goods Sold [Member] | Natur-Tec [Member]
    
Direct cost of goods sold    
Cost of Goods Sold 439,673 296,561
% of Product Sales 88.60% 78.20%
Indirect Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Cost of Goods Sold $ 607,004 $ 455,116