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Note 12 - Geographic and Segment Information (Details) - Cost of Goods Sold by Segment (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Direct cost of goods sold    
Indirect cost of goods sold $ 17,803,153 $ 15,473,212
Indirect cost of goods sold 66.40% 68.80%
ZERUST [Member] | Direct Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Indirect cost of goods sold 12,941,234 11,408,604
Indirect cost of goods sold 54.30% 55.80%
Natur-Tec [Member] | Direct Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Indirect cost of goods sold 2,234,736 1,731,398
Indirect cost of goods sold 75.00% 84.70%
Indirect Cost of Goods Sold [Member]
    
Direct cost of goods sold    
Indirect cost of goods sold $ 2,627,183 $ 2,333,210