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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 | 6 Months Ended
--- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012
Net sales |  |  | $ 54,247,135 | $ 54,792,662
Gross profit |  |  | 25,852,537 | 25,945,925
Net income |  |  | 4,728,680 | 4,798,435
Northern Technologies International Corporation’s share of equity in income of joint ventures | 1,138,438 | 1,224,675 | 2,292,734 | 2,582,355
EXCOR [Member] |  |  |  |
Net sales |  |  | 17,451,153 | 16,958,519
Gross profit |  |  | 9,105,579 | 8,860,381
Net income |  |  | 3,260,575 | 3,158,682
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 1,631,125 | 1,576,496
China [Member] |  |  |  |
Net sales |  |  | 6,929,260 |
Gross profit |  |  | 3,290,660 |
Net income |  |  | 524,546 |
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 262,148 |
All Other [Member] |  |  |  |
Net sales |  |  | 29,866,722 | 27,351,999
Gross profit |  |  | 13,456,298 | 12,380,147
Net income |  |  | 943,559 | 363,697
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  | 399,461 | 313,744
NTI ASEAN [Member] |  |  |  |
Net sales |  |  |  | 10,482,144
Gross profit |  |  |  | 4,705,397
Net income |  |  |  | 1,276,056
Northern Technologies International Corporation’s share of equity in income of joint ventures |  |  |  | $ 692,115

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