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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, 2014 | Aug. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 61,491,957 | $ 63,052,410
Total assets | 65,466,964 | 68,417,142
Current liabilities | 17,542,634 | 16,107,597
Noncurrent liabilities | 1,929,488 | 2,488,057
Joint ventures’ equity | 45,994,842 | 49,821,488
Northern Technologies International Corporation’s share of joint ventures’ equity | 22,961,989 | 24,702,981
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 20,540,523 | 22,281,510
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 24,361,157 | 25,955,136
Total assets | 26,652,165 | 28,391,787
Current liabilities | 3,512,143 | 3,572,004
Joint ventures’ equity | 23,140,022 | 24,819,783
Northern Technologies International Corporation’s share of joint ventures’ equity | 11,570,013 | 12,409,893
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 11,539,108 | 12,378,988
China [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 9,774,680 | 11,200,355
Total assets | 9,793,803 | 11,226,755
Current liabilities | 4,438,380 | 3,080,118
Noncurrent liabilities | 868,377 | 871,886
Joint ventures’ equity | 4,487,046 | 7,274,751
Northern Technologies International Corporation’s share of joint ventures’ equity | 2,243,524 | 3,637,375
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | 2,193,524 | 3,587,375
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 27,356,120 | 25,896,919
Total assets | 29,020,996 | 28,798,600
Current liabilities | 9,592,111 | 9,455,475
Noncurrent liabilities | 1,061,111 | 1,616,171
Joint ventures’ equity | 18,367,775 | 17,726,954
Northern Technologies International Corporation’s share of joint ventures’ equity | 9,148,452 | 8,655,713
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings | $ 6,807,891 | $ 6,315,147

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