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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	Aug. 31, 2018	Aug. 31, 2017
Current assets	$ 58,086,747	$ 51,518,210
Total assets	62,803,261	55,633,891
Current liabilities	15,991,886	15,118,074
Noncurrent liabilities	403,653	181,210
Joint ventures’ equity	46,407,722	40,334,607
Northern Technologies International Corporation’s share of joint ventures’ equity	22,950,995	20,035,074
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	20,921,783	17,960,860
EXCOR [Member]
Current assets	27,354,788	22,142,514
Total assets	30,033,750	24,301,194
Current liabilities	4,535,954	4,469,567
Noncurrent liabilities
Joint ventures’ equity	25,497,796	19,831,627
Northern Technologies International Corporation’s share of joint ventures’ equity	12,748,899	9,915,816
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	12,717,994	9,884,911
All Other [Member]
Current assets	30,731,959	29,375,696
Total assets	32,769,511	31,332,697
Current liabilities	11,455,932	10,648,507
Noncurrent liabilities	403,653	181,210
Joint ventures’ equity	20,909,926	20,502,980
Northern Technologies International Corporation’s share of joint ventures’ equity	10,195,263	10,119,258
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	$ 8,203,789	$ 8,075,949

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