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Note 6 - Investments in Joint Ventures (Tables) | 6 Months Ended
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Feb. 28, 2013
Schedule of Condensed Balance Sheet [Table Text Block] |
|  | At February 28, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 61,997,739 |  |  | $ | 22,196,110 |  |  | $ | 12,442,364 |  |  | $ | 27,359,265 |
Total assets |  |  | 68,522,275 |  |  |  | 24,625,927 |  |  |  | 12,474,170 |  |  |  | 31,422,178 |
Current liabilities |  |  | 19,532,691 |  |  |  | 3,848,126 |  |  |  | 5,094,516 |  |  |  | 10,590,049 |
Noncurrent liabilities |  |  | 4,210,364 |  |  |  | — |  |  |  | 856,978 |  |  |  | 3,353,386 |
Joint ventures’ equity |  |  | 44,779,219 |  |  |  | 20,777,801 |  |  |  | 6,522,675 |  |  |  | 17,478,742 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 22,189,562 |  |  |  | 10,388,902 |  |  |  | 3,261,338 |  |  |  | 8,539,322 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |  | $ | 20,075,092 |  |  | $ | 10,357,997 |  |  | $ | 3,215,436 |  |  | $ | 6,501,659 |
|  | 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] |
|  | Six Months Ended February 28, 2013 |
|  | Total |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 54,247,135 |  |  | $ | 17,451,153 |  |  | $ | 6,929,260 |  |  | $ | 29,866,722 |
Gross profit |  |  | 25,852,537 |  |  |  | 9,105,579 |  |  |  | 3,290,660 |  |  |  | 13,456,298 |
Net income |  |  | 4,728,680 |  |  |  | 3,260,575 |  |  |  | 524,546 |  |  |  | 943,559 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 2,292,734 |  |  | $ | 1,631,125 |  |  | $ | 262,148 |  |  | $ | 399,461 |
|  | Six Months Ended February 29, 2012 |
|  | Total |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 54,792,662 |  |  | $ | 16,958,519 |  |  | $ | 10,482,144 |  |  | $ | 27,351,999 |
Gross profit |  |  | 25,945,925 |  |  |  | 8,860,381 |  |  |  | 4,705,397 |  |  |  | 12,380,147 |
Net income |  |  | 4,798,435 |  |  |  | 3,158,682 |  |  |  | 1,276,056 |  |  |  | 363,697 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 2,582,355 |  |  | $ | 1,576,496 |  |  | $ | 692,115 |  |  | $ | 313,744 |

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