Note 11 - Geographic and Segment Information (Tables)

3 Months Ended

Nov. 30, 2014

Note 11 - Geographic and Segment Information (Tables) [Line Items]

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

	Three Months Ended
	November 30, 2014			November 30, 2013
Inside the U.S.A. to unaffiliated customers		67.1	%		71.1	%
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		11.4			10.6
Unaffiliated customers		21.5			18.3
		100.0	%		100.0	%

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

	Three Months Ended
	November 30, 2014		November 30, 2013
ZERUST® net sales	$	6,238,071	$	5,749,013
Natur-Tec® net sales		976,024		560,087
Total net sales	$	7,214,095	$	6,309,100

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

	November 30, 2014		% of Product Sales*			November 30, 2013		% of Product Sales*
Direct cost of goods sold
ZERUST®	$	3,338,588		53.5	%	$	3,081,764		53.6	%
Natur-Tec®		782,575		80.2	%		449,464		80.3	%
Indirect cost of goods sold		685,448	NA				626,803	NA
Total net cost of goods sold	$	4,806,611				$	4,158,031

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

	At November 30, 2014		At August 31, 2014
Brazil	$	1,148,099	$	1,429,054
India		357,352		363,894
United States		51,542,551		52,264,827
Total assets	$	53,048,002	$	54,057,775

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

	Three Months Ended
	November 30, 2014		November 30, 2013
Brazil	$	763,585	$	602,362
India		206,907		—
United States		6,243,603		5,706,738
Total net sales	$	7,214,095	$	6,309,100

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended
	November 30, 2014			November 30, 2013
Brazil	$	(28,757	)	$	(56,809	)
India		(9,099	)		—
United States		1,675,514			1,571,109
Total operating income	$	1,637,658		$	1,514,300

Fees For Services Provided to Joint Ventures [Member]

Note 11 - Geographic and Segment Information (Tables) [Line Items]

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

	Three Months Ended
	November 30, 2014		% of Total Fees for Services Provided to Joint Ventures			November 30, 2013		% of Total Fees for Services Provided to Joint Ventures
China	$	516,139		24.2	%	$	588,182		27.9	%
Germany		238,321		11.2	%		263,555		12.5	%
Korea		191,499		9.0	%		161,424		7.7	%
Poland		171,223		8.0	%		164,567		7.8	%
Japan		160,341		7.5	%		173,282		8.2	%
Thailand		140,634		6.6	%		152,558		7.2	%
France		133,379		6.3	%		128,103		6.1	%
United Kingdom		96,371		4.5	%		74,697		3.5	%
Finland		93,522		4.4	%		105,202		5.0	%
Sweden		86,920		4.1	%		109,970		5.2	%
India		69,291		3.2	%		—		0.0	%
Other		236,030		11.0	%		188,108		8.9	%
	$	2,133,670		100.0	%	$	2,109,648		100.0	%