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Note 6 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2012
Schedule of Condensed Balance Sheet [Table Text Block] |
|  | 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 |  |  |  | — |  |  |  | 1,055,965 |  |  |  | 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 |
|  | August 31, 2011 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Current assets |  | $ | 66,956,061 |  |  | $ | 24,411,880 |  |  | $ | 14,565,219 |  |  | $ | 27,978,962 |
Total assets |  |  | 73,155,916 |  |  |  | 27,093,874 |  |  |  | 14,759,582 |  |  |  | 31,302,460 |
Current liabilities |  |  | 24,712,555 |  |  |  | 5,145,239 |  |  |  | 6,123,684 |  |  |  | 13,443,632 |
Noncurrent liabilities |  |  | 4,605,837 |  |  |  | — |  |  |  | 1,020,034 |  |  |  | 3,585,803 |
Joint ventures’ equity |  |  | 43,752,524 |  |  |  | 21,948,635 |  |  |  | 7,615,864 |  |  |  | 14,273,025 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 20,559,509 |  |  |  | 10,931,819 |  |  |  | 2,803,194 |  |  |  | 6,824,496 |
Northern Technologies International Corporation's share of joint ventures' undistributed earnings |  | $ | 18,967,125 |  |  | $ | 10,900,914 |  |  | $ | 2,432,235 |  |  | $ | 5,633,976 |
Schedule of Condensed Income Statement [Table Text Block] |
|  | Fiscal Year Ended August 31, 2012 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 111,830,961 |  |  | $ | 36,027,979 |  |  | $ | 22,035,035 |  |  | $ | 53,767,947 |
Gross profit |  |  | 50,679,875 |  |  |  | 18,667,848 |  |  |  | 9,621,930 |  |  |  | 22,390,097 |
Net income |  |  | 11,987,323 |  |  |  | 6,656,298 |  |  |  | 3,585,476 |  |  |  | 1,745,549 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 5,519,794 |  |  | $ | 3,318,213 |  |  | $ | 1,414,248 |  |  | $ | 787,333 |
|  | Fiscal Year Ended August 31, 2011 |
|  | TOTAL |  |  | EXCOR |  |  | NTI ASEAN |  |  | All Other |
Net sales |  | $ | 119,276,553 |  |  | $ | 39,038,653 |  |  | $ | 18,938,928 |  |  | $ | 61,298,972 |
Gross profit |  |  | 54,135,274 |  |  |  | 19,080,420 |  |  |  | 8,812,415 |  |  |  | 26,242,439 |
Net income |  |  | 12,221,658 |  |  |  | 6,804,175 |  |  |  | 3,147,978 |  |  |  | 2,269,505 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ | 5,536,243 |  |  | $ | 3,274,333 |  |  | $ | 1,212,250 |  |  | $ | 1,049,660 |

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