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Note 6 - Investments in Joint Ventures (Tables) | 3 Months Ended
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Nov. 30, 2013
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | At November 30, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 69,537,387 |  |  | $ | 28,620,328 |  |  | $ | 13,276,704 |  |  | $ | 27,640,355 |
Total assets |  |  | 75,031,656 |  |  |  | 31,073,588 |  |  |  | 13,300,849 |  |  |  | 30,657,219 |
Current liabilities |  |  | 18,698,770 |  |  |  | 3,679,090 |  |  |  | 4,819,611 |  |  |  | 10,200,069 |
Noncurrent liabilities |  |  | 2,649,141 |  |  |  | — |  |  |  | 875,652 |  |  |  | 1,773,489 |
Joint ventures’ equity |  |  | 53,683,746 |  |  |  | 27,394,498 |  |  |  | 7,605,586 |  |  |  | 18,683,661 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 26,628,577 |  |  |  | 13,697,250 |  |  |  | 3,802,793 |  |  |  | 9,128,534 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 24,654,443 |  |  | $ | 13,666,345 |  |  | $ | 3,752,793 |  |  | $ | 7,235,305 |
|  | At August 31, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 63,052,410 |  |  | $ | 25,955,136 |  |  | $ | 11,200,355 |  |  | $ | 25,896,919 |
Total assets |  |  | 68,417,142 |  |  |  | 28,391,787 |  |  |  | 11,226,755 |  |  |  | 28,798,600 |
Current liabilities |  |  | 16,107,597 |  |  |  | 3,572,004 |  |  |  | 3,080,118 |  |  |  | 9,455,475 |
Noncurrent liabilities |  |  | 2,488,057 |  |  |  | — |  |  |  | 871,886 |  |  |  | 1,616,171 |
Joint ventures’ equity |  |  | 49,821,488 |  |  |  | 24,819,783 |  |  |  | 7,274,751 |  |  |  | 17,726,954 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 24,702,981 |  |  |  | 12,409,893 |  |  |  | 3,637,375 |  |  |  | 8,655,713 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 22,281,510 |  |  | $ | 12,378,988 |  |  | $ | 3,587,375 |  |  | $ | 6,315,147 |
Condensed Income Statement [Table Text Block] |
|  | Three Months Ended November 30, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 29,661,218 |  |  | $ | 9,476,403 |  |  | $ | 4,294,138 |  |  | $ | 15,890,677 |
Gross profit |  |  | 14,166,070 |  |  |  | 5,063,662 |  |  |  | 2,016,809 |  |  |  | 7,085,599 |
Net income |  |  | 2,837,565 |  |  |  | 1,853,307 |  |  |  | 298,708 |  |  |  | 685,550 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 1,427,748 |  |  | $ | 926,654 |  |  | $ | 149,354 |  |  | $ | 351,740 |
|  | Three Months Ended November 30, 2012 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 27,524,934 |  |  | $ | 8,609,463 |  |  | $ | 3,568,798 |  |  | $ | 15,346,673 |
Gross profit |  |  | 13,127,067 |  |  |  | 4,434,290 |  |  |  | 1,730,402 |  |  |  | 6,962,375 |
Net income |  |  | 2,440,560 |  |  |  | 1,570,374 |  |  |  | 294,003 |  |  |  | 576,183 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 1,154,296 |  |  | $ | 785,187 |  |  | $ | 147,001 |  |  | $ | 222,108 |

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