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Note 10 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment (USD $)
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Note 10 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]        
Cost of Goods Sold $ 4,669,322 $ 4,054,364 $ 12,879,186 $ 11,379,249
Direct Cost of Goods Sold [Member] | ZERUST [Member]
        
Note 10 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]        
Cost of Goods Sold 3,288,809 3,115,980 9,336,363 8,383,345
% of Product Sales 54.90% 57.50% 54.00% 56.20%
Direct Cost of Goods Sold [Member] | Natur-Tec [Member]
        
Note 10 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]        
Cost of Goods Sold 695,778 367,485 1,635,815 1,260,305
% of Product Sales 74.90% 80.10% 76.00% 84.50%
Indirect Cost of Goods Sold [Member]
        
Note 10 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment [Line Items]        
Cost of Goods Sold $ 684,735 $ 570,899 $ 1,907,008 $ 1,735,599