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Note 6 - Investments in Joint Ventures (Tables)

3 Months Ended

Nov. 30, 2014

Equity Method Investments and Joint Ventures [Abstract]

Condensed Balance Sheet [Table Text Block]

		At November 30, 2014
		Total				EXCOR				China				All Other
Current assets		$	63,676,926			$	25,235,772			$	10,271,450			$	28,169,704
Total assets			67,341,357				27,164,361				10,289,207				29,887,789
Current liabilities			18,187,978				3,334,169				4,665,093				10,188,716
Noncurrent liabilities			2,497,563				—				868,779				1,628,784
Joint ventures’ equity			46,655,816				23,830,192				4,755,335				18,070,289
Northern Technologies International Corporation’s share of joint ventures’ equity			23,302,301				11,915,098				2,377,668				9,009,535
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings		$	21,178,153			$	11,884,193			$	2,327,668			$	6,966,292

		At 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

Condensed Income Statement [Table Text Block]

		Three Months Ended November 30, 2014
		Total				EXCOR				China				All Other
Net sales		$	29,120,852			$	9,524,270			$	3,735,457			$	15,861,125
Gross profit			14,035,784				4,974,751				1,783,673				7,277,360
Net income			3,184,570				1,956,191				265,648				962,731
Northern Technologies International Corporation’s share of equity in income of joint ventures		$	1,606,683			$	978,096			$	132,824			$	495,763

		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