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Note 12 - Geographic And Segment Information (Tables)

12 Months Ended

Aug. 31, 2012

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

		Fiscal Year Ended August 31,
		2012				2011
Inside the U.S.A. to unaffiliated customers			64.0	%			63.2	%
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly			12.1	%			16.5	%
Unaffiliated customers			23.9	%			20.3	%
			100.0	%			100.0	%

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

		Fiscal 2012				Fiscal 2011				$ Change				% Change
ZERUST® net sales		$	20,971,275			$	18,542,523			$	2,428,752				13.1	%
Natur-Tec® net sales			1,810,378				984,004				826,374				84.0	%
		$	22,781,653			$	19,526,527			$	3,255,126				16.7	%

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

		Fiscal 2012				% of Product Sales*				Fiscal 2011				% of Product Sales*
Direct cost of goods sold
ZERUST®		$	10,748,865				51.3	%		$	10,087,637				54.4	%
Natur-Tec®			1,585,731				87.6	%			702,608				71.4	%
Indirect cost of goods sold			2,194,190				—				1,978,395				—
		$	14,528,785				63.8	%		$	12,768,640				65.4	%

Schedule of Condensed Balance Sheet [Table Text Block]

		August 31, 2012
		TOTAL				EXCOR				NTI ASEAN				All Other
Current assets		$	61,973,725			$	24,357,139			$	15,358,967			$	22,257,619
Total assets			68,585,974				26,620,589				15,522,456				26,442,929
Current liabilities			18,686,181				4,749,574				5,763,857				8,172,750
Noncurrent liabilities			4,700,458				—				1,055,965				3,644,493
Joint ventures’ equity			45,199,335				21,871,015				8,702,634				14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity			21,461,492				10,935,509				3,685,404				6,840,579
Northern Technologies International Corporation's share of joint ventures' undistributed earnings		$	19,403,150			$	10,904,604			$	3,314,445			$	5,184,101

		August 31, 2011
		TOTAL				EXCOR				NTI ASEAN				All Other
Current assets		$	66,956,061			$	24,411,880			$	14,565,219			$	27,978,962
Total assets			73,155,916				27,093,874				14,759,582				31,302,460
Current liabilities			24,712,555				5,145,239				6,123,684				13,443,632
Noncurrent liabilities			4,605,837				—				1,020,034				3,585,803
Joint ventures’ equity			43,752,524				21,948,635				7,615,864				14,273,025
Northern Technologies International Corporation’s share of joint ventures’ equity			20,559,509				10,931,819				2,803,194				6,824,496
Northern Technologies International Corporation's share of joint  ventures' undistributed earnings		$	18,967,125			$	10,900,914			$	2,432,235			$	5,633,976

Schedule of Condensed Income Statement [Table Text Block]

		Fiscal Year Ended August 31, 2012
		TOTAL				EXCOR				NTI ASEAN				All Other
Net sales		$	111,830,961			$	36,027,979			$	22,035,035			$	53,767,947
Gross profit			50,679,875				18,667,848				9,621,930				22,390,097
Net income			11,987,323				6,656,298				3,585,476				1,745,549
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	5,519,794			$	3,318,213			$	1,414,248			$	787,333

		Fiscal Year Ended August 31, 2011
		TOTAL				EXCOR				NTI ASEAN				All Other
Net sales		$	119,276,553			$	39,038,653			$	18,938,928			$	61,298,972
Gross profit			54,135,274				19,080,420				8,812,415				26,242,439
Net income			12,221,658				6,804,175				3,147,978				2,269,505
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	5,536,243			$	3,274,333			$	1,212,250			$	1,049,660

Fees For Services Provided to Joint Ventures [Member]

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

		Fiscal 2012				% of Total Fees for Services Provided to Joint Ventures in Fiscal 2012				Fiscal 2011				% of Total Fees for Services Provided to Joint Ventures in Fiscal 2011
Japan		$	1,022,386				22.1	%		$	1,184,205				19.3	%
Germany			994,347				21.5	%			1,066,659				17.4	%
Sweden			587,069				12.7	%			575,271				9.4	%
France			517,708				11.2	%			727,653				11.9	%
Finland			491,988				10.6	%			535,913				8.7	%
Poland			456,837				9.9	%			317,020				5.2	%
United Kingdom			309,938				6.7	%			306,586				5.0	%
India			(192,758	)			(4.1	)%			844,147				13.8	%
Other			435,398				9.4	%			572,525				9.3	%
		$	4,622,912				100.0	%		$	6,129,979				100.0	%

Brazil [Member]

Schedule of Condensed Balance Sheet [Table Text Block]

	At August 31, 2012
	Brazil		North America		Total
Total assets	$1,744,693		$40,132,934		$41,877,627

	At August 31, 2011
	Brazil		North America		Total
Total assets	$1,308,996		$38,730,746		$40,039,742

Schedule of Condensed Income Statement [Table Text Block]

	Fiscal Year Ended August 31, 2012
	Brazil		North America		Total
Net sales	$4,783,900		$17,997,753		$22,781,653
Operating income	$1,513,891		$3,055,878		$4,569,769

	Fiscal Year Ended August 31, 2011
	Brazil		North America		Total
Net sales	$3,530,531		$15,995,996		$19,526,527
Operating income	$708,378		$3,917,059		$4,625,437

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