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Note 6 - Investments in Joint Ventures (Tables)

3 Months Ended

Nov. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Condensed Balance Sheet [Table Text Block]

		At November 30, 2013
		Total				EXCOR				China				All Other
Current assets		$	69,537,387			$	28,620,328			$	13,276,704			$	27,640,355
Total assets			75,031,656				31,073,588				13,300,849				30,657,219
Current liabilities			18,698,770				3,679,090				4,819,611				10,200,069
Noncurrent liabilities			2,649,141				—				875,652				1,773,489
Joint ventures’ equity			53,683,746				27,394,498				7,605,586				18,683,661
Northern Technologies International Corporation’s share of joint ventures’ equity			26,628,577				13,697,250				3,802,793				9,128,534
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings		$	24,654,443			$	13,666,345			$	3,752,793			$	7,235,305

		At August 31, 2013
		Total				EXCOR				China				All Other
Current assets		$	63,052,410			$	25,955,136			$	11,200,355			$	25,896,919
Total assets			68,417,142				28,391,787				11,226,755				28,798,600
Current liabilities			16,107,597				3,572,004				3,080,118				9,455,475
Noncurrent liabilities			2,488,057				—				871,886				1,616,171
Joint ventures’ equity			49,821,488				24,819,783				7,274,751				17,726,954
Northern Technologies International Corporation’s share of joint ventures’ equity			24,702,981				12,409,893				3,637,375				8,655,713
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings		$	22,281,510			$	12,378,988			$	3,587,375			$	6,315,147

Condensed Income Statement [Table Text Block]

		Three Months Ended November 30, 2013
		Total				EXCOR				China				All Other
Net sales		$	29,661,218			$	9,476,403			$	4,294,138			$	15,890,677
Gross profit			14,166,070				5,063,662				2,016,809				7,085,599
Net income			2,837,565				1,853,307				298,708				685,550
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	1,427,748			$	926,654			$	149,354			$	351,740

		Three Months Ended November 30, 2012
		Total				EXCOR				China				All Other
Net sales		$	27,524,934			$	8,609,463			$	3,568,798			$	15,346,673
Gross profit			13,127,067				4,434,290				1,730,402				6,962,375
Net income			2,440,560				1,570,374				294,003				576,183
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	1,154,296			$	785,187			$	147,001			$	222,108