Note 6 - Investments in Joint Ventures (Tables)

12 Months Ended

Aug. 31, 2017

Notes Tables

Condensed Balance Sheet [Table Text Block]

	As of August 31, 2017
	Total		EXCOR		All Other
Current assets	$	51,518,210	$	22,142,514	$	29,375,696
Total assets		55,633,891		24,301,194		31,332,697
Current liabilities		15,118,074		4,469,567		10,648,507
Noncurrent liabilities		181,210		—		181,210
Joint ventures’ equity		40,334,607		19,831,627		20,502,980
Northern Technologies International Corporation’s share of joint ventures’ equity		20,035,074		9,915,816		10,119,258
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	$	17,960,860	$	9,884,911	$	8,075,949

	As of August 31, 2016
	Total		EXCOR		All Other
Current assets	$	48,922,924	$	22,928,810	$	25,994,114
Total assets		52,407,026		24,733,340		27,673,686
Current liabilities		12,433,700		3,485,231		8,948,469
Noncurrent liabilities		100,783		—		100,783
Joint ventures’ equity		39,872,543		21,248,109		18,624,434
Northern Technologies International Corporation’s share of joint ventures’ equity		19,840,774		10,624,056		9,216,728
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings	$	17,779,912	$	10,593,151	$	7,186,761

Condensed Income Statement [Table Text Block]

	Fiscal Year Ended August 31, 2017
	Total		EXCOR		All Other
Net sales	$	101,261,132	$	39,849,757	$	61,411,375
Gross profit		44,861,300		21,133,632		23,727,668
Net income		11,839,933		8,369,728		3,470,205
Northern Technologies International Corporation’s share of equity in income of joint ventures		5,898,908		4,185,988		1,712,920
Northern Technologies International Corporation's dividends received from joint ventures	$	6,377,054	$	5,379,062	$	997,992

	Fiscal Year Ended August 31, 2016
	Total		EXCOR		All Other
Net sales	$	90,646,833	$	35,138,214	$	55,508,619
Gross profit		40,440,726		18,635,421		21,805,305
Net income		9,534,771		7,049,462		2,485,309
Northern Technologies International Corporation’s share of equity in income from joint ventures		4,743,831		3,534,113		1,209,718
Northern Technologies International Corporation’s dividends received from joint ventures	$	5,503,314	$	4,364,700	$	1,165,614