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Note 7 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures (USD $) | Aug. 31, 2013 | Aug. 31, 2012
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 63,052,410 | $ 61,973,725
Total assets | 68,417,142 | 68,585,974
Current liabilities | 16,107,597 | 18,686,181
Noncurrent liabilities | 2,488,057 | 4,700,458
Joint ventures’ equity | 49,821,488 | 45,199,335
Northern Technologies International Corporation’s share of joint ventures’ equity | 24,702,981 | 21,461,492
Northern Technologies International Corporation's share of joint ventures' undistributed earnings | 22,281,510 | 19,403,150
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 25,955,136 | 24,357,139
Total assets | 28,391,787 | 26,620,589
Current liabilities | 3,572,004 | 4,749,574
Joint ventures’ equity | 24,819,783 | 21,871,015
Northern Technologies International Corporation’s share of joint ventures’ equity | 12,409,893 | 10,935,509
Northern Technologies International Corporation's share of joint ventures' undistributed earnings | 12,378,988 | 10,904,604
China [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 11,200,355 |
Total assets | 11,226,755 |
Current liabilities | 3,080,118 |
Noncurrent liabilities | 871,886 |
Joint ventures’ equity | 7,274,751 |
Northern Technologies International Corporation’s share of joint ventures’ equity | 3,637,375 |
Northern Technologies International Corporation's share of joint ventures' undistributed earnings | 3,587,375 |
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 25,896,919 | 22,257,619
Total assets | 28,798,600 | 26,442,929
Current liabilities | 9,455,475 | 8,172,750
Noncurrent liabilities | 1,616,171 | 3,644,493
Joint ventures’ equity | 17,726,954 | 14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity | 8,655,713 | 6,840,579
Northern Technologies International Corporation's share of joint ventures' undistributed earnings | 6,315,147 | 5,184,101
NTI ASEAN [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets |  | 15,358,967
Total assets |  | 15,522,456
Current liabilities |  | 5,763,857
Noncurrent liabilities |  | 1,055,965
Joint ventures’ equity |  | 8,702,634
Northern Technologies International Corporation’s share of joint ventures’ equity |  | 3,685,404
Northern Technologies International Corporation's share of joint ventures' undistributed earnings |  | $ 3,314,445

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