Note 11 - Segment and Geographical Information (Tables)

3 Months Ended

Nov. 30, 2017

Notes Tables

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

	Three Months Ended
	November 30, 2017		November 30, 2016
ZERUST® net sales	$	9,527,737	$	8,084,678
Natur-Tec® net sales		2,015,301		1,617,345
Total net sales	$	11,543,038	$	9,702,023

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

	November 30, 2017		% of Product Sales*		November 30, 2016		% of Product Sales*
Direct cost of goods sold
ZERUST®	$	5,803,980		60.9%	$	4,699,537		58.1%
Natur-Tec®		1,479,199		73.4%		1,213,168		75.0%
Indirect cost of goods sold		605,291		NA		700,061		NA
Total net cost of goods sold	$	7,888,470			$	6,612,766

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

	Three Months Ended
	November 30, 2017		November 30, 2016
Inside the U.S.A. to unaffiliated customers	$	6,256,205	$	5,268,999
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		507,631		701,799
Unaffiliated customers		4,779,202		3,731,225
	$	11,543,038	$	9,702,023

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

	At November 30, 2017		At August 31, 2017
China	$	207,094	$	228,458
Brazil		50,784		54,646
Germany		16,619		14,171
India		13,642		14,712
United States		6,947,162		7,047,675
Total property and equipment	$	7,235,301	$	7,359,662

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

	Three Months Ended
	November 30, 2017		November 30, 2016
China	$	2,911,643	$	1,546,810
Brazil		639,841		601,524
India		495,539		331,610
Germany		48,771		118,259
Other		683,407		1,133,022
United States		6,763,837		5,970,798
Total net sales	$	11,543,038	$	9,702,023

Fees for Services Provided to Joint Ventures [Member]

Notes Tables

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

	Three Months Ended
	November 30, 2017		% of Total Fees for Services Provided to Joint Ventures			November 30, 2016		% of Total Fees for Services Provided to Joint Ventures
Germany	$	219,873		14.6	%	$	203,000		15.4	%
Poland		206,076		13.7	%		149,204		11.3	%
Japan		174,045		11.5	%		146,037		11.1	%
France		139,641		9.3	%		97,673		7.4	%
Sweden		127,954		8.5	%		87,061		6.6	%
United Kingdom		111,775		7.4	%		86,131		6.5	%
Thailand		102,531		6.8	%		147,455		11.2	%
Finland		89,627		5.9	%		76,336		5.8	%
India		86,763		5.8	%		64,535		4.9	%
Czech Republic		84,225		5.6	%		70,828		5.4	%
South Korea		83,488		5.5	%		105,378		8.0	%
Other		81,144		5.4	%		81,953		6.2	%
	$	1,507,142		100.0	%	$	1,315,591		100.0	%