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Note 7 - Investments in Joint Ventures (Tables)

12 Months Ended

Aug. 31, 2014

Equity Method Investments and Joint Ventures [Abstract]

Condensed Balance Sheet [Table Text Block]

		August 31, 2014
		TOTAL				EXCOR				China				All Other
Current assets		$	61,491,957			$	24,361,157			$	9,774,680			$	27,356,120
Total assets			65,466,964				26,652,165				9,793,803				29,020,996
Current liabilities			17,542,634				3,512,143				4,438,380				9,592,111
Noncurrent liabilities			1,929,488				—				868,377				1,061,111
Joint ventures’ equity			45,994,842				23,140,022				4,487,046				18,367,775
Northern Technologies International Corporation’s share of joint ventures’ equity			22,961,989				11,570,013				2,243,524				9,148,452
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings		$	20,540,523			$	11,539,108			$	2,193,524			$	6,807,891

		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]

		Fiscal Year Ended August 31, 2014
		TOTAL				EXCOR				China				All Other
Net sales		$	118,848,890			$	39,944,812			$	15,920,685			$	62,983,393
Gross profit			56,960,918				21,045,091				7,463,168				28,452,659
Net income			11,842,338				7,906,693				1,274,487				2,661,158
Northern Technologies International Corporation’s share of equity in income from joint ventures		$	5,920,603			$	3,950,915			$	626,763			$	1,342,925

		Fiscal Year Ended August 31, 2013
		TOTAL				EXCOR				China				All Other
Net sales		$	113,189,068			$	36,476,544			$	15,161,289			$	61,551,235
Gross profit			52,058,609				19,470,322				7,153,395				25,434,891
Net income			10,650,542				7,009,897				1,157,995				2,482,650
Northern Technologies International Corporation’s share of equity in income from joint ventures		$	5,237,711			$	3,507,057			$	579,376			$	1,151,278