Note 11 - Segment and Geographic Information (Tables)

9 Months Ended

May 31, 2019

Notes Tables

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

	Three Months Ended				Nine Months Ended
		May 31, 2019		May 31, 2018		May 31, 2019		May 31, 2018
ZERUST® net sales	$	10,077,203	$	10,382,884	$	29,250,772	$	30,102,080
Natur-Tec® net sales		4,815,914		2,540,953		13,051,801		6,578,770
Total net sales	$	14,893,117	$	12,923,837	$	42,302,573	$	36,680,850

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

	Three Months Ended										Nine Months Ended
	May 31, 2019		% of Segment Sales*			May 31, 2018		% of Segment Sales*			May 31, 2019		% of Segment Sales*			May 31, 2018		% of Segment Sales*
Direct cost of goods sold
ZERUST®	$	5,725,220		56.8	%	$	6,139,699		59.1	%	$	16,596,536		56.7	%	$	17,948,941		59.6	%
Natur-Tec®		3,670,282		76.2	%		1,812,084		71.3	%		10,181,050		78.0	%		4,738,523		72.0	%
Indirect cost of goods sold		742,851		—			640,583		—			2,106,003		—			1,806,208		—
Total net cost of goods sold	$	10,138,353				$	8,592,366				$	28,883,589				$	24,493,672

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

	Three Months Ended				Nine Months Ended
		May 31, 2019		May 31, 2018		May 31, 2019		May 31, 2018
Inside the U.S.A. to unaffiliated customers	$	6,172,882	$	7,434,991	$	19,564,756	$	19,771,031
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		1,112,313		879,324		2,304,455		2,201,077
Unaffiliated customers		7,607,922		4,609,522		20,433,362		14,708,742
	$	14,893,117	$	12,923,837	$	42,302,573	$	36,680,850

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

		At May 31, 2019		At August 31, 2018
China	$	341,145	$	205,490
Brazil		117,811		71,677
India		51,208		22,220
Other		15,619		7,058
United States		6,767,354		6,862,381
Total property and equipment	$	7,293,137	$	7,168,826

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

	Three Months Ended				Nine Months Ended
		May 31, 2019		May 31, 2018		May 31, 2019		May 31, 2018
China	$	3,691,220	$	3,069,232	$	9,864,479	$	9,176,174
Brazil		792,299		853,675		2,343,894		2,310,131
India		2,283,346		564,339		6,159,136		1,642,633
Other		1,953,370		1,267,475		4,370,308		2,875,428
United States		6,172,882		7,169,116		19,564,756		20,676,484
Total net sales	$	14,893,117	$	12,923,837	$	42,302,573	$	36,680,850

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, 2019	% of Total Fees for Services Provided to Joint Ventures			May 31, 2018	% of Total Fees for Services Provided to Joint Ventures
Germany	$	212,825	14.8	%	$	224,366	14.9	%
Poland		181,057	12.6	%		185,107	12.3	%
Japan		164,136	11.5	%		183,335	12.2	%
Sweden		137,642	9.6	%		155,588	10.3	%
India		114,705	8.0	%		49,778	3.3	%
France		112,063	7.8	%		146,949	9.7	%
Thailand		109,427	7.6	%		110,894	7.4	%
South Korea		85,732	6.0	%		96,574	6.4	%
Czech Republic		83,086	5.8	%		100,131	6.6	%
Finland		75,135	5.2	%		81,402	5.4	%
United Kingdom		70,972	5.0	%		80,931	5.4	%
Other		87,043	6.1	%		93,445	6.1	%
	$	1,433,823	100.0	%	$	1,508,500	100.0	%

	Nine Months Ended
		May 31, 2019	% of Total Fees for Services Provided to Joint Ventures			May 31, 2018	% of Total Fees for Services Provided to Joint Ventures
Germany	$	643,154	15.0	%	$	680,939	14.7	%
Poland		551,430	12.8	%		598,221	13.0	%
Japan		501,432	11.6	%		529,412	11.4	%
Sweden		417,635	9.7	%		448,707	9.7	%
France		328,395	7.6	%		416,913	9.0	%
Thailand		313,075	7.3	%		325,205	7.0	%
India		294,833	6.9	%		274,980	5.9	%
Czech Republic		266,706	6.2	%		283,193	6.1	%
United Kingdom		261,961	6.1	%		275,137	6.0	%
South Korea		259,612	6.0	%		279,524	6.0	%
Finland		221,599	5.2	%		247,574	5.4	%
Other		239,200	5.6	%		264,727	5.8	%
	$	4,299,032	100.0	%	$	4,624,532	100.0	%