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Note 6 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2020
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
|  | 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 |
|  | As of August 31, 2019
|  | Total |  | EXCOR |  | All Other
Current assets |  | $ | 59,162,834 |  |  | $ | 29,139,787 |  |  | $ | 30,023,047 |
Total assets |  |  | 63,326,703 |  |  |  | 31,666,841 |  |  |  | 31,659,862 |
Current liabilities |  |  | 14,145,499 |  |  |  | 3,573,160 |  |  |  | 10,572,339 |
Noncurrent liabilities |  |  | 20,797 |  |  |  | — |  |  |  | 20,797 |
Joint ventures' equity |  |  | 49,160,407 |  |  |  | 28,093,681 |  |  |  | 21,066,726 |
Northern Technologies International Corporation's share of joint ventures' equity |  |  | 24,207,339 |  |  |  | 14,046,842 |  |  |  | 10,160,497 |
Northern Technologies International Corporation's share of joint ventures' undistributed earnings |  |  | 22,178,126 |  |  |  | 14,015,937 |  |  |  | 8,162,189 |
Condensed Income Statement [Table Text Block] |
|  | 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 |
|  | Fiscal Year Ended August 31, 2019
|  | Total |  | EXCOR |  | All Other
Net sales |  | $ | 114,635,435 |  |  | $ | 47,015,841 |  |  | $ | 67,619,594 |
Gross profit |  |  | 51,312,013 |  |  |  | 25,622,261 |  |  |  | 25,689,752 |
Net income |  |  | 14,688,999 |  |  |  | 10,827,448 |  |  |  | 3,861,551 |
Northern Technologies International Corporation's share of equity in income of joint ventures |  |  | 7,225,518 |  |  |  | 5,415,362 |  |  |  | 1,810,156 |
Northern Technologies International Corporation's dividends received from joint ventures |  |  | 5,039,041 |  |  |  | 3,345,600 |  |  |  | 1,693,441 |

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