Note 11 - Segment and Geographic Information - Total Net Sales by Geographic Distribution (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Net sales by segment	$ 14,893,117	$ 12,923,837	$ 42,302,573	$ 36,680,850
CHINA
Net sales by segment	3,691,220	3,069,232	9,864,479	9,176,174
BRAZIL
Net sales by segment	792,299	853,675	2,343,894	2,310,131
INDIA
Net sales by segment	2,283,346	564,339	6,159,136	1,642,633
Other Countries [Member]
Net sales by segment	1,953,370	1,267,475	4,370,308	2,875,428
UNITED STATES
Net sales by segment	$ 6,172,882	$ 7,169,116	$ 19,564,756	$ 20,676,484