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Note 6 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2019
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
|  | 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 |
|  | As of August 31, 2018
|  | Total |  | EXCOR |  | All Other
Current assets |  | $ | 58,086,747 |  |  | $ | 27,354,788 |  |  | $ | 30,731,959 |
Total assets |  |  | 62,803,261 |  |  |  | 30,033,750 |  |  |  | 32,769,511 |
Current liabilities |  |  | 15,991,886 |  |  |  | 4,535,954 |  |  |  | 11,455,932 |
Noncurrent liabilities |  |  | 403,653 |  |  |  | — |  |  |  | 403,653 |
Joint ventures’ equity |  |  | 46,407,722 |  |  |  | 25,497,796 |  |  |  | 20,909,926 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 22,950,995 |  |  |  | 12,748,899 |  |  |  | 10,195,263 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 20,921,783 |  |  | $ | 12,717,994 |  |  | $ | 8,203,789 |
Condensed Income Statement [Table Text Block] |
|  | 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 |
|  | Fiscal Year Ended August 31, 2018
|  | Total |  | EXCOR |  | All Other
Net sales |  | $ | 120,060,897 |  |  | $ | 47,537,949 |  |  | $ | 72,522,948 |
Gross profit |  |  | 53,348,459 |  |  |  | 25,584,666 |  |  |  | 27,763,793 |
Net income |  |  | 15,300,276 |  |  |  | 11,095,523 |  |  |  | 4,204,753 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 7,527,383 |  |  |  | 5,549,765 |  |  |  | 1,977,618 |
Northern Technologies International Corporation’s dividends received from joint ventures |  | $ | 3,697,503 |  |  | $ | 2,357,544 |  |  | $ | 1,339,959 |

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