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Note 11 - Segment and Geographic Information - Total Net Sales by Geographic Distribution (Details) - USD ($)	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Total net sales	$ 12,923,837	$ 10,223,019	$ 36,680,850	$ 28,667,945
CHINA
Total net sales	3,069,232	1,695,508	9,176,174	4,991,807
BRAZIL
Total net sales	853,675	565,089	2,310,131	1,683,255
INDIA
Total net sales	564,339	323,551	1,642,633	1,057,132
GERMANY
Total net sales	312,057	161,139	556,859	378,635
Other Countries [Member]
Total net sales	955,418	583,752	2,318,569	2,115,511
UNITED STATES
Total net sales	$ 7,169,116	$ 6,893,980	$ 20,676,484	$ 18,441,605

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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