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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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