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Note 7 - Investments in Joint Ventures (Tables)

12 Months Ended

Aug. 31, 2015

Notes Tables

Condensed Balance Sheet [Table Text Block]

		August 31, 2015
		TOTAL				EXCOR				India				Finland				All Other

Current assets		$	49,295,116			$	22,620,323			$	4,035,396			$	1,415,816			$	21,223,581
Total assets			52,853,938				24,606,880				4,328,196				2,197,047				21,721,815
Current liabilities			12,288,383				3,360,142				1,030,718				178,961				7,718,562
Noncurrent liabilities			1,215,139				—				155,168				433,624				626,347
Joint ventures’ equity			39,350,417				21,246,738				3,142,310				1,584,461				13,376,908
Northern Technologies International Corporation’s share of joint ventures’ equity			20,544,238				11,571,361				1,482,342				840,263				6,650,272
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings		$	18,483,377			$	11,540,456			$	617,520			$	820,263			$	5,505,138

		August 31, 2014
		TOTAL				EXCOR				Tianjin Zerust				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

Condensed Income Statement [Table Text Block]

		Fiscal Year Ended August 31, 2015
		TOTAL				EXCOR				India				Finland				All Other

Net sales		$	99,026,251			$	36,872,664			$	7,000,715			$	3,557,252			$	51,595,620
Gross profit			48,397,318				19,993,763				3,292,243				1,858,310				23,253,002
Net income			11,849,107				8,201,659				983,179				518,900				2,145,369
Northern Technologies International Corporation’s share of equity in income from joint ventures		$	5,936,565			$	4,091,608			$	492,379			$	263,749			$	1,088,829

		Fiscal Year Ended August 31, 2014
		TOTAL				EXCOR				Tianjin Zerust				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				Tianjin Zerust				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