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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | Aug. 31, 2021 | Aug. 31, 2020
--- | --- | ---
Current assets | $ 33,747,089 | $ 33,202,350
Total assets | 74,370,879 | 66,074,488
Current liabilities | 8,516,196 | 6,097,604
Noncurrent liabilities | 104,102 | 272,443
Joint ventures’ equity | 62,368,026 | 56,659,415
Investments in joint ventures | 27,623,768 | 24,090,826
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Current assets | 69,394,796 | 55,825,418
Total assets | 73,814,402 | 60,295,587
Current liabilities | 16,366,398 | 11,002,867
Noncurrent liabilities | 1,455,524 | 365,274
Joint ventures’ equity | 55,992,480 | 48,927,446
Investments in joint ventures | 27,623,768 | 24,090,826
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 24,702,778 | 21,855,747
EXCOR [Member] |  |
Current assets | 33,886,655 | 25,742,619
Total assets | 36,211,520 | 28,449,772
Current liabilities | 5,386,377 | 2,424,565
Noncurrent liabilities | 0 | 0
Joint ventures’ equity | 30,825,144 | 26,025,207
Investments in joint ventures | 15,412,574 | 13,012,606
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 14,697,490 | 12,981,701
All Other [Member] |  |
Current assets | 35,508,141 | 15,994,506
Total assets | 37,602,882 | 16,413,073
Current liabilities | 10,980,021 | 4,088,235
Noncurrent liabilities | 1,455,524 | 332,275
Joint ventures’ equity | 25,167,336 | 11,992,563
Investments in joint ventures | 12,211,194 | 5,621,446
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | $ 10,005,288 | 4,404,094
Joint Ventures in France [Member] |  |
Current assets |  | 4,099,160
Total assets |  | 4,873,484
Current liabilities |  | 2,073,710
Noncurrent liabilities |  | 0
Joint ventures’ equity |  | 2,799,774
Investments in joint ventures |  | 1,399,887
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 1,399,887
Joint Ventures in Finland [Member] |  |
Current assets |  | 1,955,879
Total assets |  | 2,261,147
Current liabilities |  | 415,496
Noncurrent liabilities |  | 0
Joint ventures’ equity |  | 1,845,651
Investments in joint ventures |  | 922,814
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 902,814
Joint Ventures in India [Member] |  |
Current assets |  | 4,010,855
Total assets |  | 4,242,660
Current liabilities |  | 1,007,529
Noncurrent liabilities |  | 32,999
Joint ventures’ equity |  | 3,202,132
Investments in joint ventures |  | 1,603,013
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | 738,191
Joint Ventures in Thailand [Member] |  |
Current assets |  | 4,022,399
Total assets |  | 4,055,451
Current liabilities |  | 993,332
Noncurrent liabilities |  | 0
Joint ventures’ equity |  | 3,062,119
Investments in joint ventures |  | 1,531,060
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ 1,429,060

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