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Note 6 - Investments in Joint Ventures (Tables) | 6 Months Ended
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Feb. 28, 2015
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | At February 28, 2015 |
|  | Total |  |  | EXCOR |  |  | All Other |
Current assets |  | $ | 46,802,727 |  |  | $ | 19,669,250 |  |  | $ | 27,133,477 |
Total assets |  |  | 50,375,058 |  |  |  | 21,662,648 |  |  |  | 28,712,410 |
Current liabilities |  |  | 12,347,251 |  |  |  | 2,837,566 |  |  |  | 9,509,685 |
Noncurrent liabilities |  |  | 1,080,425 |  |  |  | — |  |  |  | 1,080,425 |
Joint ventures’ equity |  |  | 36,947,382 |  |  |  | 18,825,082 |  |  |  | 18,122,300 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 18,377,038 |  |  |  | 9,412,543 |  |  |  | 8,964,499 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 16,252,890 |  |  | $ | 9,381,638 |  |  | $ | 6,871,252 |
|  | At August 31, 2014 |
|  | Total |  |  | EXCOR |  |  | Tianjin Zerust |  |  | All Other |
Current assets |  | $ | 61,491,957 |  |  | $ | 24,361,157 |  |  | $ | 9,774,680 |  |  | $ | 27,356,120 |
Total assets |  |  | 65,466,964 |  |  |  | 26,652,165 |  |  |  | 9,793,803 |  |  |  | 29,020,996 |
Current liabilities |  |  | 17,542,634 |  |  |  | 3,512,143 |  |  |  | 4,438,380 |  |  |  | 9,592,111 |
Noncurrent liabilities |  |  | 1,929,488 |  |  |  | — |  |  |  | 868,377 |  |  |  | 1,061,111 |
Joint ventures’ equity |  |  | 45,994,842 |  |  |  | 23,140,022 |  |  |  | 4,487,046 |  |  |  | 18,367,775 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 22,961,989 |  |  |  | 11,570,013 |  |  |  | 2,243,524 |  |  |  | 9,148,452 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 20,540,523 |  |  | $ | 11,539,108 |  |  | $ | 2,193,524 |  |  | $ | 6,807,891 |
Condensed Income Statement [Table Text Block] |
|  | Six Months Ended February 28, 2015 |
|  | Total |  |  | EXCOR |  |  | Tianjin Zerust |  |  | All Other |
Net sales |  | $ | 52,178,238 |  |  | $ | 18,383,653 |  |  | $ | 3,735,457 |  |  | $ | 30,059,128 |
Gross profit |  |  | 25,540,546 |  |  |  | 9,766,973 |  |  |  | 1,783,673 |  |  |  | 13,989,900 |
Net income |  |  | 6,152,182 |  |  |  | 3,924,547 |  |  |  | 265,648 |  |  |  | 1,961,987 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 3,081,331 |  |  | $ | 1,962,047 |  |  | $ | 132,824 |  |  | $ | 986,460 |
|  | Six Months Ended February 28, 2014 |
|  | Total |  |  | EXCOR |  |  | Tianjin Zerust |  |  | All Other |
Net sales |  | $ | 58,050,376 |  |  | $ | 18,963,579 |  |  | $ | 8,257,630 |  |  | $ | 30,829,167 |
Gross profit |  |  | 27,600,668 |  |  |  | 10,072,948 |  |  |  | 3,834,419 |  |  |  | 13,693,301 |
Net income |  |  | 5,479,724 |  |  |  | 3,763,017 |  |  |  | 553,963 |  |  |  | 1,162,744 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 2,823,199 |  |  | $ | 1,881,705 |  |  | $ | 276,948 |  |  | $ | 664,546 |

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