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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	Aug. 31, 2019	Aug. 31, 2018
Current assets	$ 59,162,834	$ 58,086,747
Total assets	63,326,703	62,803,261
Current liabilities	14,145,499	15,991,886
Noncurrent liabilities	20,797	403,653
Joint ventures’ equity	49,160,407	46,407,722
Northern Technologies International Corporation’s share of joint ventures’ equity	24,207,339	22,950,995
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	22,178,126	20,921,783
EXCOR [Member]
Current assets	29,139,787	27,354,788
Total assets	31,666,841	30,033,750
Current liabilities	3,573,160	4,535,954
Noncurrent liabilities
Joint ventures’ equity	28,093,681	25,497,796
Northern Technologies International Corporation’s share of joint ventures’ equity	14,046,842	12,748,899
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	14,015,937	12,717,994
All Other [Member]
Current assets	30,023,047	30,731,959
Total assets	31,659,862	32,769,511
Current liabilities	10,572,339	11,455,932
Noncurrent liabilities	20,797	403,653
Joint ventures’ equity	21,066,726	20,909,926
Northern Technologies International Corporation’s share of joint ventures’ equity	10,160,497	10,195,263
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	$ 8,162,189	$ 8,203,789

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