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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | Feb. 28, 2023 | Aug. 31, 2022
--- | --- | ---
Current assets | $ 40,176,602 | $ 40,234,881
Total assets | 86,710,505 | 86,193,953
Current liabilities | 16,178,289 | 17,065,401
Noncurrent liabilities | 1,824,222 | 1,884,256
Joint ventures’ equity | 65,264,351 | 63,595,262
Investments in joint ventures | 21,522,496 | 21,814,754
EXCOR and All Other Joint Venturs [Member] |  |
Investments in joint ventures | 21,522,496 | 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 | 12,106,429 | 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 | 9,416,067 | 9,320,434
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 8,418,337 | 8,793,508
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Current assets | 54,425,899 | 52,428,831
Total assets | 57,924,227 | 55,854,457
Current liabilities | 14,002,680 | 10,981,833
Noncurrent liabilities | 346,645 | 1,138,980
Joint ventures’ equity | 43,574,902 | 43,733,644
EXCOR [Member] |  |
Current assets | 25,538,114 | 26,047,914
Total assets | 27,376,219 | 27,932,532
Current liabilities | 3,163,365 | 2,943,895
Noncurrent liabilities |  | 0
Joint ventures’ equity | 24,212,854 | 24,988,637
Joint Ventures in France [Member] |  |
Current assets |  | 26,380,917
Total assets |  | 27,921,925
Current liabilities |  | 8,037,938
Noncurrent liabilities |  | 1,138,980
Joint ventures’ equity |  | $ 18,745,007
All Other [Member] |  |
Current assets | 28,887,785 |
Total assets | 30,548,008 |
Current liabilities | 10,839,315 |
Noncurrent liabilities | 346,645 |
Joint ventures’ equity | $ 19,362,048 |

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