Note 11 - Segment and Geographical Information - Cost of Goods Sold by Segment (Details) - USD ($)		3 Months Ended
		Nov. 30, 2017	Nov. 30, 2016
Cost of goods sold		$ 7,888,470	$ 6,612,766	[1]
Precentage of product sales	[1]
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 5,803,980	$ 4,699,537	[1]
Precentage of product sales	[1]	60.90%	58.10%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 1,479,199	$ 1,213,168	[1]
Precentage of product sales	[1]	73.40%	75.00%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 605,291	$ 700,061	[1]
Precentage 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.