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Note 11 - Segment and Geographic Information (Tables)

9 Months Ended

May 31, 2018

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

		Three Months Ended								Nine Months Ended
		May 31, 2018				May 31, 2017				May 31, 2018				May 31, 2017
ZERUST® net sales		$	10,382,884			$	8,368,487			$	30,102,080			$	23,681,192
Natur-Tec® net sales			2,540,953				1,854,532				6,578,770				4,986,753
Total net sales		$	12,923,837			$	10,223,019			$	36,680,850			$	28,667,945

Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]

		Three Months Ended																Nine Months Ended
		May 31, 2018				% of Segment Sales*				May 31, 2017				% of Segment Sales*				May 31, 2018				% of Segment Sales*				May 31, 2017				% of Segment Sales*
Direct cost of goods sold
ZERUST®		$	6,139,699				59.1	%		$	4,834,355				57.8	%		$	17,948,941				59.6	%		$	13,788,416				58.2	%
Natur-Tec®			1,812,084				71.3	%			1,327,323				71.6	%			4,738,523				72.0	%			3,608,722				72.4	%
Indirect cost of goods sold			640,583				—				612,323				—				1,806,208				—				1,859,815				—
Total net cost of goods sold		$	8,592,366							$	6,774,001							$	24,493,672							$	19,256,953

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

		Three Months Ended								Nine Months Ended
		May 31, 2018				May 31, 2017				May 31, 2018				May 31, 2017
Inside the U.S.A. to unaffiliated customers		$	7,434,991			$	5,967,459			$	19,771,031			$	16,363,291
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly			879,324				862,136				2,201,077				2,115,511
Unaffiliated customers			4,609,522				3,393,424				14,708,742				10,189,143
		$	12,923,837			$	10,223,019			$	36,680,850			$	28,667,945

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

		At May 31, 2018				At August 31, 2017
China		$	251,848			$	228,458
Brazil			81,161				54,646
Germany			10,155				14,171
India			21,628				14,712
United States			6,868,515				7,047,675
Total property and equipment		$	7,233,307			$	7,359,662

Revenue from External Customers by Geographic Areas [Table Text Block]

		Three Months Ended								Nine Months Ended
		May 31, 2018				May 31, 2017				May 31, 2018				May 31, 2017
China		$	3,069,232			$	1,695,508			$	9,176,174			$	4,991,807
Brazil			853,675				565,089				2,310,131				1,683,255
India			564,339				323,551				1,642,633				1,057,132
Germany			312,057				161,139				556,859				378,635
Other			955,418				583,752				2,318,569				2,115,511
United States			7,169,116				6,893,980				20,676,484				18,441,605
Total net sales		$	12,923,837			$	10,223,019			$	36,680,850			$	28,667,945

Fees for Services Provided to Joint Ventures [Member]

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

		Three Months Ended
		May 31, 2018				% of Total Fees for Services Provided to Joint Ventures				May 31, 2017				% of Total Fees for Services Provided to Joint Ventures
Germany		$	224,366				14.9	%		$	212,257				14.7	%
Poland			185,107				12.3	%			180,969				12.6	%
Japan			183,335				12.2	%			153,903				10.7	%
Sweden			155,588				10.3	%			150,139				10.4	%
France			146,949				9.7	%			112,455				7.8	%
Thailand			110,894				7.4	%			104,771				7.3	%
Czech Republic			100,131				6.6	%			74,135				5.1	%
Korea			96,574				6.4	%			92,954				6.4	%
Finland			81,402				5.4	%			78,012				5.4	%
United Kingdom			80,931				5.4	%			87,768				6.1	%
India			49,778				3.3	%			90,469				6.3	%
Other			93,445				6.1	%			104,216				7.2	%
		$	1,508,500				100.0	%		$	1,442,048				100.0	%

		Nine Months Ended
		May 31, 2018				% of Total Fees for Services Provided to Joint Ventures				May 31, 2017				% of Total Fees for Services Provided to Joint Ventures
Germany		$	680,939				14.7	%		$	614,766				15.6	%
Poland			598,221				13.0	%			483,626				12.3	%
Japan			529,412				11.4	%			445,662				11.3	%
Sweden			448,707				9.7	%			314,664				8.0	%
France			416,913				9.0	%			293,240				7.4	%
Thailand			325,205				7.0	%			339,852				8.6	%
Czech Republic			283,193				6.1	%			218,249				5.5	%
Korea			279,524				6.0	%			284,435				7.2	%
United Kingdom			275,137				6.0	%			227,140				5.8	%
India			274,980				5.9	%			229,200				5.8	%
Finland			247,574				5.4	%			221,294				5.6	%
Other			264,727				5.8	%			269,539				6.9	%
		$	4,624,532				100.0	%		$	3,941,667				100.0	%

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