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Note 12 - Geographic and Segment Information (Tables)

9 Months Ended

May. 31, 2015

Note 12 - 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								Nine Months Ended
		May 31, 2015				May 31, 2014				May 31, 2015				May 31, 2014
Inside the U.S.A. to unaffiliated customers			63.0	%			69.0	%			63.8	%			67.4	%
Outside the U.S.A to:
Joint ventures in which the Company is a shareholder directly and indirectly			7.3	%			13.6	%			11.7	%			12.4	%
Unaffiliated customers			29.7	%			17.4	%			24.5	%			20.2	%
			100.0	%			100.0	%			100.0	%			100.0	%

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

		Three Months Ended								Nine Months Ended
		May 31, 2015				May 31, 2014				May 31, 2015				May 31, 2014
ZERUST® sales		$	7,076,760			$	5,992,095			$	19,098,816			$	17,296,159
Natur-Tec™ sales			1,200,815				928,725				3,121,563				2,152,769
Total net sales		$	8,277,575			$	6,920,820			$	22,220,379			$	19,448,928

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

		Three Months Ended																Nine Months Ended
		May 31, 2015				% of Product Sales*				May 31, 2014				% of Product Sales*				May 31, 2015				% of Product Sales*				May 31, 2014				% of Product Sales*
Direct cost of goods sold
ZERUST®		$	3,942,776				55.7	%		$	3,288,809				54.9	%		$	10,452,467				54.7	%		$	9,336,363				54.0	%
Natur-Tec®			889,976				74.1	%			695,778				74.9	%			2,391,599				76.6	%			1,635,815				76.0	%
Indirect cost of goods sold			762,455				—				684,735				—				2,215,492				—				1,907,008				—
Total net cost of goods sold		$	5,595,207							$	4,669,322							$	15,059,558							$	12,879,186

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

		As of May 31, 2015				As of August 31, 2014
Brazil		$	1,046,801			$	1,429,054
China			1,395,952				—
India			389,659				363,894
United States			49,038,999				52,264,827
Total assets		$	51,871,411			$	54,057,775

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

		Nine Months Ended
		May 31, 2015				May 31, 2014
Brazil		$	2,103,589			$	1,865,137
China			442,262				—
India			708,635				361,700
United States			18,965,893				17,222,091
Total net sales		$	22,220,379			$	19,448,928

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

		Nine Months Ended
		May 31, 2015				May 31, 2014
Brazil		$	(72,785	)		$	(75,491	)
China			(585,790	)			—
India			20,440				5,872
United States			3,594,827				5,002,383
Total operating income		$	2,956,692			$	4,932,764

Fees For Services Provided to Joint Ventures [Member]

Note 12 - Geographic and Segment Information (Tables) [Line Items]

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

		Three Months Ended
		May 31, 2015				% of Total Fees for Services Provided to Joint Ventures				May 31, 2014				% of Total Fees for Services Provided to Joint Ventures
Germany		$	219,182				16.8	%		$	257,215				12.8	%
Poland			149,771				11.5	%			152,157				7.6	%
Thailand			128,164				9.8	%			148,113				7.4	%
Japan			124,772				9.6	%			170,079				8.5	%
France			108,788				8.4	%			139,719				7.0	%
Sweden			103,234				7.9	%			130,613				6.5	%
United Kingdom			93,229				7.2	%			127,697				6.4	%
Finland			74,711				5.7	%			87,416				4.4	%
India			72,285				5.5	%			204,777				10.2	%
China			—				0.0	%			478,979				23.9	%
Other			229,828				17.6	%			104,840				5.3	%
		$	1,303,964				100.0	%		$	2,001,775				100.0	%

		Nine Months Ended
		May 31, 2015				% of Total Fees for Services Provided to Joint Ventures				May 31, 2014				% of Total Fees for Services Provided to Joint Ventures
Germany		$	660,135				14.9	%		$	784,326				12.7	%
China			516,139				11.6	%			1,590,612				25.8	%
Poland			437,607				9.9	%			469,242				7.6	%
Thailand			425,316				9.6	%			431,112				7.0	%
Japan			409,316				9.2	%			510,769				8.3	%
France			318,686				7.2	%			390,794				6.3	%
United Kingdom			304,600				6.9	%			282,329				4.6	%
Sweden			262,451				5.9	%			332,806				5.4	%
Finland			220,926				5.0	%			269,155				4.4	%
India			215,548				4.9	%			371,635				6.0	%
Other			661,770				14.9	%			736,314				11.9	%
		$	4,432,494				100.0	%		$	6,169,094				100.0	%

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