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Note 6 - Investments in Joint Ventures (Tables)

6 Months Ended

Feb. 28, 2013

Schedule of Condensed Balance Sheet [Table Text Block]

		At February 28, 2013
		Total				EXCOR				China				All Other
Current assets		$	61,997,739			$	22,196,110			$	12,442,364			$	27,359,265
Total assets			68,522,275				24,625,927				12,474,170				31,422,178
Current liabilities			19,532,691				3,848,126				5,094,516				10,590,049
Noncurrent liabilities			4,210,364				—				856,978				3,353,386
Joint ventures’ equity			44,779,219				20,777,801				6,522,675				17,478,742
Northern Technologies International Corporation’s share of joint ventures’ equity			22,189,562				10,388,902				3,261,338				8,539,322
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings		$	20,075,092			$	10,357,997			$	3,215,436			$	6,501,659

		At 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				—				1,055965				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

Schedule of Condensed Income Statement [Table Text Block]

		Six Months Ended February 28, 2013
		Total				EXCOR				China				All Other
Net sales		$	54,247,135			$	17,451,153			$	6,929,260			$	29,866,722
Gross profit			25,852,537				9,105,579				3,290,660				13,456,298
Net income			4,728,680				3,260,575				524,546				943,559
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	2,292,734			$	1,631,125			$	262,148			$	399,461

		Six Months Ended February 29, 2012
		Total				EXCOR				NTI ASEAN				All Other
Net sales		$	54,792,662			$	16,958,519			$	10,482,144			$	27,351,999
Gross profit			25,945,925				8,860,381				4,705,397				12,380,147
Net income			4,798,435				3,158,682				1,276,056				363,697
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	2,582,355			$	1,576,496			$	692,115			$	313,744