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Note 6 - Investments in Joint Ventures (Tables)

12 Months Ended

Aug. 31, 2012

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