Note 11 - Segment and Geographical Information - Net Sales by Geographic Location (Details) - USD ($)	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Net sales by segment	$ 11,543,038	$ 9,702,023
Inside the USA to Unaffiliated Customers [Member]
Net sales by segment	6,256,205	5,268,999
Joint Ventures in Which the Company is a Shareholder Directly and Indirectly Outside the USA [Member]
Net sales by segment	507,631	701,799
Unaffiliated Customers Outside the USA [Member]
Net sales by segment	$ 4,779,202	$ 3,731,225