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Note 6 - Investments in Joint Ventures (Tables) | 3 Months Ended
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Nov. 30, 2012
Schedule of Condensed Balance Sheet [Table Text Block] |
|  | At November 30, 2012 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 61,936,535 |  |  | $ | 21,440,244 |  |  | $ | 11,933,790 |  |  | $ | 28,562,501 |
Total assets |  |  | 68,157,107 |  |  |  | 23,756,509 |  |  |  | 11,968,500 |  |  |  | 32,432,098 |
Current liabilities |  |  | 20,079,934 |  |  |  | 4,737,085 |  |  |  | 4,822,792 |  |  |  | 10,520,057 |
Noncurrent liabilities |  |  | 4,815,797 |  |  |  | — |  |  |  | 856,547 |  |  |  | 3,959,250 |
Joint ventures’ equity |  |  | 43,261,376 |  |  |  | 19,019,424 |  |  |  | 6,289,161 |  |  |  | 17,952,791 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 21,435,223 |  |  |  | 9,509,714 |  |  |  | 3,148,679 |  |  |  | 8,776,830 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 19,341,157 |  |  | $ | 9,478,809 |  |  | $ | 3,095,230 |  |  | $ | 6,767,118 |
|  | At August 31, 2012 |
|  | Total |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Current assets |  | $ | 61,973,725 |  |  | $ | 24,357,139 |  |  | $ | 15,358,967 |  |  | $ | 22,257,619 |
Total assets |  |  | 68,585,974 |  |  |  | 26,620,589 |  |  |  | 15,522,456 |  |  |  | 26,442,929 |
Current liabilities |  |  | 18,686,181 |  |  |  | 4,749,574 |  |  |  | 5,763,857 |  |  |  | 8,172,750 |
Noncurrent liabilities |  |  | 4,700,458 |  |  |  | — |  |  |  | 1,055965 |  |  |  | 3,644,493 |
Joint ventures’ equity |  |  | 45,199,335 |  |  |  | 21,871,015 |  |  |  | 8,702,634 |  |  |  | 14,625,686 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 21,461,492 |  |  |  | 10,935,509 |  |  | $ | 3,685,404 |  |  |  | 6,840,579 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 19,403,150 |  |  | $ | 10,904,604 |  |  | $ | 3,314,445 |  |  | $ | 5,184,101 |
Schedule of Condensed Income Statement [Table Text Block] |
|  | 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 |
|  | Three Months Ended November 30, 2011 |
|  | Total |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 28,795,232 |  |  | $ | 8,542,250 |  |  | $ | 5,022,328 |  |  | $ | 15,230,654 |
Gross profit |  |  | 13,339,072 |  |  |  | 4,325,802 |  |  |  | 2,286,705 |  |  |  | 6,726,565 |
Net income |  |  | 2,538,769 |  |  |  | 1,457,055 |  |  |  | 738,922 |  |  |  | 689,348 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 1,357,680 |  |  | $ | 728,528 |  |  | $ | 369,461 |  |  | $ | 259,691 |

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