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Note 6 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2021
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
|  | As of August 31, 2021 |
|  | Total |  |  | EXCOR |  |  | OTHER |
Current assets |  | $ | 69,394,796 |  |  | $ | 33,886,655 |  |  | $ | 35,508,141 |
Total assets |  |  | 73,814,402 |  |  |  | 36,211,520 |  |  |  | 37,602,882 |
Current liabilities |  |  | 16,366,398 |  |  |  | 5,386,377 |  |  |  | 10,980,021 |
Noncurrent liabilities |  |  | 1,455,524 |  |  |  | - |  |  |  | 1,455,524 |
Joint ventures’ equity |  |  | 55,992,480 |  |  |  | 30,825,144 |  |  |  | 25,167,336 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 27,623,768 |  |  |  | 15,412,574 |  |  |  | 12,211,194 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  |  | 24,702,778 |  |  |  | 14,697,490 |  |  |  | 10,005,288 |
|  | As of August 31, 2020 |
|  | Total |  |  | EXCOR |  |  | FRANCE |  |  | FINLAND |  |  | INDIA |  |  | THAILAND |  |  | OTHER |
Current assets |  | $ | 55,825,418 |  |  | $ | 25,742,619 |  |  | $ | 4,099,160 |  |  | $ | 1,955,879 |  |  | $ | 4,010,855 |  |  | $ | 4,022,399 |  |  | $ | 15,994,506 |
Total assets |  |  | 60,295,587 |  |  |  | 28,449,772 |  |  |  | 4,873,484 |  |  |  | 2,261,147 |  |  |  | 4,242,660 |  |  |  | 4,055,451 |  |  |  | 16,413,073 |
Current liabilities |  |  | 11,002,867 |  |  |  | 2,424,565 |  |  |  | 2,073,710 |  |  |  | 415,496 |  |  |  | 1,007,529 |  |  |  | 993,332 |  |  |  | 4,088,235 |
Noncurrent liabilities |  |  | 365,274 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 32,999 |  |  |  | — |  |  |  | 332,275 |
Joint ventures’ equity |  |  | 48,927,446 |  |  |  | 26,025,207 |  |  |  | 2,799,774 |  |  |  | 1,845,651 |  |  |  | 3,202,132 |  |  |  | 3,062,119 |  |  |  | 11,992,563 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 24,090,826 |  |  |  | 13,012,606 |  |  |  | 1,399,887 |  |  |  | 922,814 |  |  |  | 1,603,013 |  |  |  | 1,531,060 |  |  |  | 5,621,446 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  |  | 21,855,747 |  |  |  | 12,981,701 |  |  |  | 1,399,887 |  |  |  | 902,814 |  |  |  | 738,191 |  |  |  | 1,429,060 |  |  |  | 4,404,094 |
Condensed Income Statement [Table Text Block] |
|  | Fiscal Year Ended August 31, 2021 |
|  | Total |  |  | EXCOR |  |  | OTHER |
Net sales |  | $ | 120,954,550 |  |  | $ | 46,522,688 |  |  | $ | 74,431,862 |
Gross profit |  |  | 53,371,610 |  |  |  | 25,389,981 |  |  |  | 27,981,629 |
Net income |  |  | 14,921,531 |  |  |  | 8,798,995 |  |  |  | 6,122,536 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 7,465,214 |  |  |  | 4,400,403 |  |  |  | 3,064,811 |
Northern Technologies International Corporation’s dividends received from joint ventures |  |  | 3,665,365 |  |  |  | 1,809,900 |  |  |  | 1,855,465 |
|  | Fiscal Year Ended August 31, 2020 |
|  | Total |  |  | EXCOR |  |  | FRANCE |  |  | FINLAND |  |  | INDIA |  |  | THAILAND |  |  | OTHER |
Net sales |  | $ | 87,030,062 |  |  | $ | 32,546,402 |  |  | $ | 8,133,294 |  |  | $ | 3,088,865 |  |  | $ | 5,481,303 |  |  | $ | 6,471,831 |  |  | $ | 31,308,367 |
Gross profit |  |  | 39,532,750 |  |  |  | 18,739,471 |  |  |  | 3,061,433 |  |  |  | 1,916,001 |  |  |  | 2,498,196 |  |  |  | 2,046,478 |  |  |  | 11,271,171 |
Net income |  |  | 8,545,473 |  |  |  | 5,266,541 |  |  |  | 473,137 |  |  |  | 419,728 |  |  |  | 697,349 |  |  |  | 503,884 |  |  |  | 1,184,834 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 4,270,327 |  |  |  | 2,622,423 |  |  |  | 237,490 |  |  |  | 209,972 |  |  |  | 349,218 |  |  |  | 253,192 |  |  |  | 598,032 |
Northern Technologies International Corporation’s dividends received from joint ventures |  |  | 5,672,099 |  |  |  | 4,675,850 |  |  |  | — |  |  |  | 325,635 |  |  |  | 261,220 |  |  |  | 160,074 |  |  |  | 249,320 |

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