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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 $) | Nov. 30, 2012 | Aug. 31, 2012
--- | --- | ---
Current assets | $ 61,936,535 | $ 61,973,725
Total assets | 68,157,107 | 68,585,974
Current liabilities | 20,079,934 | 18,686,181
Noncurrent liabilities | 4,815,797 | 4,700,458
Joint ventures’ equity | 43,261,376 | 45,199,335
Northern Technologies International Corporation’s share of joint ventures’ equity | 21,435,223 | 21,461,492
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 19,341,157 | 19,403,150
EXCOR [Member] |  |
Current assets | 21,440,244 | 24,357,139
Total assets | 23,756,509 | 26,620,589
Current liabilities | 4,737,085 | 4,749,574
Joint ventures’ equity | 19,019,424 | 21,871,015
Northern Technologies International Corporation’s share of joint ventures’ equity | 9,509,714 | 10,935,509
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 9,478,809 | 10,904,604
China [Member] |  |
Current assets | 11,933,790 |
Total assets | 11,968,500 |
Current liabilities | 4,822,792 |
Noncurrent liabilities | 856,547 |
Joint ventures’ equity | 6,289,161 |
Northern Technologies International Corporation’s share of joint ventures’ equity | 3,148,679 |
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 3,095,230 |
All Other [Member] |  |
Current assets | 28,562,501 | 22,257,619
Total assets | 32,432,098 | 26,442,929
Current liabilities | 10,520,057 | 8,172,750
Noncurrent liabilities | 3,959,250 | 3,644,493
Joint ventures’ equity | 17,952,791 | 14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity | 8,776,830 | 6,840,579
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings | 6,767,118 | 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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