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Note 7 - Condensed Balance Sheet of EXCOR and Tianjin Zerust, and All Other Joint Ventures (Details) - USD ($) | Aug. 31, 2015 | Aug. 31, 2014
--- | --- | ---
EXCOR [Member] |  |
Current assets | $ 22,620,323 | $ 24,361,157
Total assets | 24,606,880 | 26,652,165
Current liabilities | $ 3,360,142 | $ 3,512,143
Noncurrent liabilities |  |
Joint ventures’ equity | $ 21,246,738 | $ 23,140,022
Northern Technologies International Corporation’s share of joint ventures’ equity | 11,571,361 | 11,570,013
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 11,540,456 | 11,539,108
Joint Venture in India [Member] |  |
Current assets | 4,035,396 |
Total assets | 4,328,196 |
Current liabilities | 1,030,718 |
Noncurrent liabilities | 155,168 |
Joint ventures’ equity | 3,142,310 |
Northern Technologies International Corporation’s share of joint ventures’ equity | 1,482,342 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 617,520 |
Tianjin Zerust [Member] |  |
Current assets |  | 9,774,680
Total assets |  | 9,793,803
Current liabilities |  | 4,438,380
Noncurrent liabilities |  | 868,377
Joint ventures’ equity |  | 4,487,046
Northern Technologies International Corporation’s share of joint ventures’ equity |  | 2,243,524
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings |  | 2,193,524
Joint Venture in Finland [Member] |  |
Current assets | 1,415,816 |
Total assets | 2,197,047 |
Current liabilities | 178,961 |
Noncurrent liabilities | 433,624 |
Joint ventures’ equity | 1,584,461 |
Northern Technologies International Corporation’s share of joint ventures’ equity | 840,263 |
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 820,263 |
All Other [Member] |  |
Current assets | 21,223,581 | 27,356,120
Total assets | 21,721,815 | 29,020,996
Current liabilities | 7,718,562 | 9,592,111
Noncurrent liabilities | 626,347 | 1,061,111
Joint ventures’ equity | 13,376,908 | 18,367,775
Northern Technologies International Corporation’s share of joint ventures’ equity | 6,650,272 | 9,148,452
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 5,505,138 | 6,807,891
Current assets | 49,295,116 | 61,491,957
Total assets | 52,853,938 | 65,466,964
Current liabilities | 12,288,383 | 17,542,634
Noncurrent liabilities | 1,215,139 | 1,929,488
Joint ventures’ equity | 39,350,417 | 45,994,842
Northern Technologies International Corporation’s share of joint ventures’ equity | 20,544,238 | 22,961,989
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | $ 18,483,377 | $ 20,540,523

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