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Note 6 - Investments in Joint Ventures (Detail) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $) | 3 Months Ended
--- | ---
Nov. 30, 2012 | Nov. 30, 2011
Net sales | $ 27,524,934 | $ 28,795,232
Gross profit | 13,127,067 | 13,339,072
Net income | 2,440,560 | 2,538,769
Northern Technologies International Corporation’s share of equity in income of joint ventures | 1,154,296 | 1,357,680
EXCOR [Member] |  |
Net sales | 8,609,463 | 8,542,250
Gross profit | 4,434,290 | 4,325,802
Net income | 1,570,374 | 1,457,055
Northern Technologies International Corporation’s share of equity in income of joint ventures | 785,187 | 728,528
China [Member] |  |
Net sales | 3,568,798 |
Gross profit | 1,730,402 |
Net income | 294,003 |
Northern Technologies International Corporation’s share of equity in income of joint ventures | 147,001 |
All Other [Member] |  |
Net sales | 15,346,673 | 15,230,654
Gross profit | 6,962,375 | 6,726,565
Net income | 576,183 | 689,348
Northern Technologies International Corporation’s share of equity in income of joint ventures | 222,108 | 259,691
NTI ASEAN [Member] |  |
Net sales |  | 5,022,328
Gross profit |  | 2,286,705
Net income |  | 738,922
Northern Technologies International Corporation’s share of equity in income of joint ventures |  | $ 369,461

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