Note 12 - Segment and Geographic Information - Net Sales by Geographic Location (Details) - USD ($)	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Net sales by segment	$ 8,742,903	$ 7,704,934	$ 18,444,926	$ 14,729,371
Inside the USA to Unaffiliated Customers [Member]
Net sales by segment	5,245,092	4,683,208	10,395,832	9,522,987
Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member]
Net sales by segment	433,317	677,320	1,253,375	1,200,347
Unaffiliated Customers Outside the USA [Member]
Net sales by segment	$ 3,064,494	$ 2,344,406	$ 6,795,719	$ 4,006,037