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Note 6 - Investments in Joint Ventures (Tables)

12 Months Ended

Aug. 31, 2020

Notes Tables

Condensed Balance Sheet [Table Text Block]

		As of August 31, 2020
		Total				EXCOR				FRANCE				FINLAND				INDIA				THAILAND				OTHER
Current assets		$	55,825,418			$	25,742,619			$	4,099,160			$	1,955,879			$	4,010,855			$	4,022,399			$	15,994,506
Total assets			60,295,587				28,449,772				4,873,484				2,261,147				4,242,660				4,055,451				16,413,073
Current liabilities			11,002,867				2,424,565				2,073,710				415,496				1,007,529				993,332				4,088,235
Noncurrent liabilities			365,274				—				—				—				32,999				—				332,275
Joint ventures' equity			48,927,446				26,025,207				2,799,774				1,845,651				3,202,132				3,062,119				11,992,563
Northern Technologies International Corporation's share of joint ventures' equity			24,090,826				13,012,606				1,399,887				922,814				1,603,013				1,531,060				5,621,446
Northern Technologies International Corporation's share of joint ventures' undistributed earnings			21,855,747				12,981,701				1,399,887				902,814				738,191				1,429,060				4,404,094

		As of August 31, 2019
		Total				EXCOR				All Other
Current assets		$	59,162,834			$	29,139,787			$	30,023,047
Total assets			63,326,703				31,666,841				31,659,862
Current liabilities			14,145,499				3,573,160				10,572,339
Noncurrent liabilities			20,797				—				20,797
Joint ventures' equity			49,160,407				28,093,681				21,066,726
Northern Technologies International Corporation's share of joint ventures' equity			24,207,339				14,046,842				10,160,497
Northern Technologies International Corporation's share of joint ventures' undistributed earnings			22,178,126				14,015,937				8,162,189

Condensed Income Statement [Table Text Block]

		Fiscal Year Ended August 31, 2020
		Total				EXCOR				FRANCE				FINLAND				INDIA				THAILAND				OTHER
Net sales		$	87,030,062			$	32,546,402			$	8,133,294			$	3,088,865			$	5,481,303			$	6,471,831			$	31,308,367
Gross profit			39,532,750				18,739,471				3,061,433				1,916,001				2,498,196				2,046,478				11,271,171
Net income			8,545,473				5,266,541				473,137				419,728				697,349				503,884				1,184,834
Northern Technologies International Corporation's share of equity in income of joint ventures			4,270,327				2,622,423				237,490				209,972				349,218				253,192				598,032
Northern Technologies International Corporation's dividends received from joint ventures			5,672,099				4,675,850				—				325,635				261,220				160,074				249,320


		Fiscal Year Ended August 31, 2019
		Total				EXCOR				All Other
Net sales		$	114,635,435			$	47,015,841			$	67,619,594
Gross profit			51,312,013				25,622,261				25,689,752
Net income			14,688,999				10,827,448				3,861,551
Northern Technologies International Corporation's share of equity in income of joint ventures			7,225,518				5,415,362				1,810,156
Northern Technologies International Corporation's dividends received from joint ventures			5,039,041				3,345,600				1,693,441