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Note 7 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | Feb. 28, 2022 | Aug. 31, 2021
--- | --- | ---
Current assets |  | $ 38,597,623 | $ 33,747,089
Total assets |  | 84,950,651 | 74,370,879
Current liabilities |  | 13,271,186 | 8,516,196
Noncurrent liabilities |  | 2,241,698 | 104,102
Joint ventures’ equity |  | 66,065,839 | 62,368,026
Investments in joint ventures |  | 21,852,070 | 27,623,768
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Current assets |  | 55,032,109 | 69,394,796
Total assets |  | 58,525,731 | 73,814,402
Current liabilities |  | 12,803,351 | 16,366,398
Noncurrent liabilities |  | 1,268,334 | 1,455,524
Joint ventures’ equity |  | 44,454,046 | 55,992,480
Investments in joint ventures |  | 21,852,070 | 27,623,768
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 20,501,921 | 24,702,778
EXCOR [Member] |  |  |
Current assets |  | 25,447,104 | 33,886,655
Total assets |  | 27,186,903 | 36,211,520
Current liabilities |  | 3,004,495 | 5,386,377
Noncurrent liabilities |  | 0 | 0
Joint ventures’ equity |  | 24,182,408 | 30,825,144
Investments in joint ventures |  | 12,091,206 | 15,412,574
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 12,060,301 | 14,697,490
All Other [Member] |  |  |
Current assets |  | 29,585,005 |
Total assets |  | 31,338,828 |
Current liabilities |  | 9,798,856 |
Noncurrent liabilities |  | 1,268,334 |
Joint ventures’ equity |  | 20,271,638 |
Investments in joint ventures |  | 9,760,864 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ 8,441,621 |
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
Investments in joint ventures | [1] |  | 12,211,194
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | [1] |  | $ 10,005,288
[1] | Includes Harita-NTI since Harita-NTI was not a consolidated subsidiary of the Company as of Augut 31, 2021 or November 30, 2020. See Note 3.

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