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Note 6 - Investments in Joint Ventures (Detail) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $) | Feb. 28, 2013 | Aug. 31, 2012
--- | --- | ---
Current assets | $ 61,997,739 | $ 61,973,725
Total assets | 68,522,275 | 68,585,974
Current liabilities | 19,532,691 | 18,686,181
Noncurrent liabilities | 4,210,364 | 4,700,458
Joint ventures’ equity | 44,779,219 | 45,199,335
Northern Technologies International Corporation’s share of joint ventures’ equity | 22,189,562 | 21,461,492
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 20,075,092 | 19,403,150
EXCOR [Member] |  |
Current assets | 22,196,110 | 24,357,139
Total assets | 24,625,927 | 26,620,589
Current liabilities | 3,848,126 | 4,749,574
Joint ventures’ equity | 20,777,801 | 21,871,015
Northern Technologies International Corporation’s share of joint ventures’ equity | 10,388,902 | 10,935,509
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 10,357,997 | 10,904,604
China [Member] |  |
Current assets | 12,442,364 |
Total assets | 12,474,170 |
Current liabilities | 5,094,516 |
Noncurrent liabilities | 856,978 |
Joint ventures’ equity | 6,522,675 |
Northern Technologies International Corporation’s share of joint ventures’ equity | 3,261,338 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 3,215,436 |
All Other [Member] |  |
Current assets | 27,359,265 | 22,257,619
Total assets | 31,422,178 | 26,442,929
Current liabilities | 10,590,049 | 8,172,750
Noncurrent liabilities | 3,353,386 | 3,644,493
Joint ventures’ equity | 17,478,742 | 14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity | 8,539,322 | 6,840,579
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 6,501,659 | 5,184,101
NTI ASEAN [Member] |  |
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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