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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | May 31, 2023 | Aug. 31, 2022 | May 31, 2003
--- | --- | --- | ---
Current assets | $ 39,289,907 | $ 40,234,881 |
Total assets | 87,313,423 | 86,193,953 |
Current liabilities | 15,550,561 | 17,065,401 |
Liabilities, Noncurrent | 1,831,914 | 1,884,256 |
Joint ventures’ equity | 66,397,187 | 63,595,262 |
Investments in joint ventures | 22,855,448 | 21,814,754 |
EXCOR and All Other Joint Venturs [Member] |  |  |
Investments in joint ventures | 22,855,448 | 21,814,754 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 20,493,861 | 21,256,923 |
EXCOR [Member] |  |  |
Investments in joint ventures | 12,982,891 | 12,494,320 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 12,075,524 | 12,463,415 |
All Other [Member] |  |  |
Investments in joint ventures |  | 9,320,434 | $ 9,872,553
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 8,793,508 | 8,418,337
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Current assets | 55,424,661 | 52,428,831 |
Total assets | 59,769,982 | 55,854,457 |
Current liabilities | 13,229,032 | 10,981,833 |
Liabilities, Noncurrent | 300,142 | 1,138,980 |
Joint ventures’ equity | 46,240,808 | 43,733,644 |
EXCOR [Member] |  |  |
Current assets | 26,845,344 | 26,047,914 |
Total assets | 28,974,034 | 27,932,532 |
Current liabilities | 3,008,256 | 2,943,895 |
Liabilities, Noncurrent | 0 | 0 |
Joint ventures’ equity | 25,965,777 | 24,988,637 |
Joint Ventures in France [Member] |  |  |
Current assets |  | 26,380,917 |
Total assets |  | 27,921,925 |
Current liabilities |  | 8,037,938 |
Liabilities, Noncurrent |  | 1,138,980 |
Joint ventures’ equity |  | $ 18,745,007 |
All Other [Member] |  |  |
Current assets |  |  | 28,579,317
Total assets |  |  | 30,795,948
Current liabilities |  |  | 10,220,776
Liabilities, Noncurrent | $ 300,142 |  |
Joint ventures’ equity |  |  | $ 20,275,031

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