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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	Feb. 29, 2020	Aug. 31, 2019
Current assets	$ 52,843,263	$ 59,162,834
Total assets	56,806,232	63,326,703
Current liabilities	13,446,110	14,145,499
Noncurrent liabilities	19,924	20,797
Joint ventures’ equity	43,340,198	49,160,407
Northern Technologies International Corporation’s share of joint ventures’ equity	21,297,202	24,207,339
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	19,267,931	22,178,126
EXCOR [Member]
Current assets	23,302,245	29,139,787
Total assets	25,573,425	31,666,841
Current liabilities	3,357,346	3,573,160
Noncurrent liabilities	0
Joint ventures’ equity	22,216,079	28,093,681
Northern Technologies International Corporation’s share of joint ventures’ equity	11,108,042	14,046,842
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	11,077,137	14,015,937
All Other [Member]
Current assets	29,541,018	30,023,047
Total assets	31,232,807	31,659,862
Current liabilities	10,088,764	10,572,339
Noncurrent liabilities	19,924	20,797
Joint ventures’ equity	21,124,119	21,066,726
Northern Technologies International Corporation’s share of joint ventures’ equity	10,189,160	10,160,497
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	$ 8,190,794	$ 8,162,189

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