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Note 12 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Cost of goods sold $ 5,870,186 $ 5,268,224 $ 12,482,952 $ 10,143,647
Precentage of product sales
Direct Cost of Goods Sold [Member] | ZERUST [Member]        
Cost of goods sold $ 4,254,524 $ 3,576,073 $ 8,954,061 $ 6,940,628
Precentage of product sales 58.90% 56.00% 58.50% 56.10%
Direct Cost of Goods Sold [Member] | NaturTec [Member]        
Cost of goods sold $ 1,068,231 $ 984,938 $ 2,281,399 $ 1,819,197
Precentage of product sales 70.50% 74.60% 72.80% 76.90%
Indirect Cost of Goods Sold [Member]        
Cost of goods sold $ 547,431 $ 707,213 $ 1,247,492 $ 1,383,822
Precentage of product sales