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Note 6 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures (USD $) | Nov. 30, 2013 | Aug. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 69,537,387 | $ 63,052,410
Total assets | 75,031,656 | 68,417,142
Current liabilities | 18,698,770 | 16,107,597
Noncurrent liabilities | 2,649,141 | 2,488,057
Joint ventures’ equity | 53,683,746 | 49,821,488
Northern Technologies International Corporation’s share of joint ventures’ equity | 26,628,577 | 24,702,981
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 24,654,443 | 22,281,510
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 28,620,328 | 25,955,136
Total assets | 31,073,588 | 28,391,787
Current liabilities | 3,679,090 | 3,572,004
Joint ventures’ equity | 27,394,498 | 24,819,783
Northern Technologies International Corporation’s share of joint ventures’ equity | 13,697,250 | 12,409,893
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 13,666,345 | 12,378,988
China [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 13,276,704 | 11,200,355
Total assets | 13,300,849 | 11,226,755
Current liabilities | 4,819,611 | 3,080,118
Noncurrent liabilities | 875,652 | 871,886
Joint ventures’ equity | 7,605,586 | 7,274,751
Northern Technologies International Corporation’s share of joint ventures’ equity | 3,802,793 | 3,637,375
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 3,752,793 | 3,587,375
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 27,640,355 | 25,896,919
Total assets | 30,657,219 | 28,798,600
Current liabilities | 10,200,069 | 9,455,475
Noncurrent liabilities | 1,773,489 | 1,616,171
Joint ventures’ equity | 18,683,661 | 17,726,954
Northern Technologies International Corporation’s share of joint ventures’ equity | 9,128,534 | 8,655,713
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | $ 7,235,305 | $ 6,315,147

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