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Note 7 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | May 31, 2022 | Aug. 31, 2021
--- | --- | ---
Current assets |  | $ 38,968,265 | $ 33,747,089
Total assets |  | 85,185,397 | 74,370,879
Current liabilities |  | 14,241,487 | 8,516,196
Noncurrent liabilities |  | 2,268,240 | 104,102
Joint ventures’ equity |  | 65,222,459 | 62,368,028
Investments in joint ventures |  | 22,194,433 | 27,623,768
EXCOR and All Other Joint Venturs [Member] |  |  |
Investments in joint ventures |  | 22,194,433 | 27,623,768
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 20,844,284 | 24,702,778
EXCOR [Member] |  |  |
Investments in joint ventures |  | 12,374,756 | 15,412,574
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 12,343,851 | 14,697,490
All Other [Member] |  |  |
Investments in joint ventures |  | 9,819,677 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 8,500,433 |
Joint Ventures in France [Member] |  |  |
Investments in joint ventures | [1] |  | 12,211,194
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | [1] |  | 10,005,288
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Current assets |  | 55,305,950 | 69,394,796
Total assets |  | 59,037,744 | 73,814,402
Current liabilities |  | 13,289,392 | 16,366,398
Noncurrent liabilities |  | 1,223,185 | 1,455,524
Joint ventures’ equity |  | 44,601,335 | 55,992,480
EXCOR [Member] |  |  |
Current assets |  | 25,677,287 | 33,886,655
Total assets |  | 27,727,623 | 36,211,520
Current liabilities |  | 2,978,114 | 5,386,377
Noncurrent liabilities |  | 0 | 0
Joint ventures’ equity |  | 24,749,509 | 30,825,144
All Other [Member] |  |  |
Current assets |  | 29,628,663 |
Total assets |  | 31,310,121 |
Current liabilities |  | 10,311,279 |
Noncurrent liabilities |  | 1,223,185 |
Joint ventures’ equity |  | $ 19,851,826 |
Joint Ventures in France [Member] |  |  |
Current assets | [1] |  | 35,508,141
Total assets | [1] |  | 37,602,882
Current liabilities | [1] |  | 10,980,021
Noncurrent liabilities | [1] |  | 1,455,524
Joint ventures’ equity | [1] |  | $ 25,167,336
[1] | Includes Zerust India since Zerust India was not a consolidated subsidiary of the Company as of August 31, 2021 or May 31, 2021. See Note 3 entitled “Business Combination.”

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