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Note 12 - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Direct Cost of Goods Sold [Member] | ZERUST [Member]        
Cost of goods sold $ 3,576,073 $ 3,171,103 $ 6,940,628 [1] $ 6,509,691 [1]
Percentage of product sales [1] 56.00% 54.80% 56.10% 54.10%
Direct Cost of Goods Sold [Member] | NaturTec [Member]        
Cost of goods sold $ 984,938 $ 719,048 $ 1,819,197 [1] $ 1,501,623 [1]
Percentage of product sales [1] 74.60% 76.10% 76.90% 78.20%
Indirect Cost of Goods Sold [Member]        
Cost of goods sold $ 707,213 $ 767,589 $ 1,383,822 [1] $ 1,453,037 [1]
Percentage of product sales [1]
Cost of goods sold $ 5,268,224 $ 4,657,740 $ 10,143,647 [1] $ 9,464,351 [1]
Percentage of product sales [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.