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Note 7 - Investments in Joint Ventures (Tables) | 12 Months Ended
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Aug. 31, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | August 31, 2014 |
|  | TOTAL |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 61,491,957 |  |  | $ | 24,361,157 |  |  | $ | 9,774,680 |  |  | $ | 27,356,120 |
Total assets |  |  | 65,466,964 |  |  |  | 26,652,165 |  |  |  | 9,793,803 |  |  |  | 29,020,996 |
Current liabilities |  |  | 17,542,634 |  |  |  | 3,512,143 |  |  |  | 4,438,380 |  |  |  | 9,592,111 |
Noncurrent liabilities |  |  | 1,929,488 |  |  |  | — |  |  |  | 868,377 |  |  |  | 1,061,111 |
Joint ventures’ equity |  |  | 45,994,842 |  |  |  | 23,140,022 |  |  |  | 4,487,046 |  |  |  | 18,367,775 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 22,961,989 |  |  |  | 11,570,013 |  |  |  | 2,243,524 |  |  |  | 9,148,452 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  | $ | 20,540,523 |  |  | $ | 11,539,108 |  |  | $ | 2,193,524 |  |  | $ | 6,807,891 |
|  | August 31, 2013 |
|  | TOTAL |  |  | EXCOR |  |  | China |  |  | All Other |
Current assets |  | $ | 63,052,410 |  |  | $ | 25,955,136 |  |  | $ | 11,200,355 |  |  | $ | 25,896,919 |
Total assets |  |  | 68,417,142 |  |  |  | 28,391,787 |  |  |  | 11,226,755 |  |  |  | 28,798,600 |
Current liabilities |  |  | 16,107,597 |  |  |  | 3,572,004 |  |  |  | 3,080,118 |  |  |  | 9,455,475 |
Noncurrent liabilities |  |  | 2,488,057 |  |  |  | — |  |  |  | 871,886 |  |  |  | 1,616,171 |
Joint ventures’ equity |  |  | 49,821,488 |  |  |  | 24,819,783 |  |  |  | 7,274,751 |  |  |  | 17,726,954 |
Northern Technologies International Corporation’s share of joint ventures’ equity |  |  | 24,702,981 |  |  |  | 12,409,893 |  |  |  | 3,637,375 |  |  |  | 8,655,713 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  | $ | 22,281,510 |  |  | $ | 12,378,988 |  |  | $ | 3,587,375 |  |  | $ | 6,315,147 |
Condensed Income Statement [Table Text Block] |
|  | Fiscal Year Ended August 31, 2014 |
|  | TOTAL |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 118,848,890 |  |  | $ | 39,944,812 |  |  | $ | 15,920,685 |  |  | $ | 62,983,393 |
Gross profit |  |  | 56,960,918 |  |  |  | 21,045,091 |  |  |  | 7,463,168 |  |  |  | 28,452,659 |
Net income |  |  | 11,842,338 |  |  |  | 7,906,693 |  |  |  | 1,274,487 |  |  |  | 2,661,158 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,920,603 |  |  | $ | 3,950,915 |  |  | $ | 626,763 |  |  | $ | 1,342,925 |
|  | Fiscal Year Ended August 31, 2013 |
|  | TOTAL |  |  | EXCOR |  |  | China |  |  | All Other |
Net sales |  | $ | 113,189,068 |  |  | $ | 36,476,544 |  |  | $ | 15,161,289 |  |  | $ | 61,551,235 |
Gross profit |  |  | 52,058,609 |  |  |  | 19,470,322 |  |  |  | 7,153,395 |  |  |  | 25,434,891 |
Net income |  |  | 10,650,542 |  |  |  | 7,009,897 |  |  |  | 1,157,995 |  |  |  | 2,482,650 |
Northern Technologies International Corporation’s share of equity in income from joint ventures |  | $ | 5,237,711 |  |  | $ | 3,507,057 |  |  | $ | 579,376 |  |  | $ | 1,151,278 |

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