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Note 5 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures (USD $) | May 31, 2014 | Aug. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 58,975,346 | $ 63,052,410
Total assets | 63,172,232 | 68,417,142
Current liabilities | 14,208,070 | 16,107,597
Noncurrent liabilities | 3,373,373 | 2,488,057
Joint ventures’ equity | 45,590,789 | 49,821,488
Company’s share of joint ventures’ equity | 22,103,275 | 24,702,981
Company’s share of joint ventures’ undistributed earnings | 19,681,808 | 22,281,510
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 22,560,299 | 25,955,136
Total assets | 24,920,587 | 28,391,787
Current liabilities | 1,956,574 | 3,572,004
Noncurrent liabilities | 1,321,199 |
Joint ventures’ equity | 21,642,814 | 24,819,783
Company’s share of joint ventures’ equity | 10,821,409 | 12,409,893
Company’s share of joint ventures’ undistributed earnings | 10,790,504 | 12,378,988
China [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 8,541,897 | 11,200,355
Total assets | 8,561,641 | 11,226,755
Current liabilities | 1,926,986 | 3,080,118
Noncurrent liabilities | 853,839 | 871,886
Joint ventures’ equity | 5,780,816 | 7,274,751
Company’s share of joint ventures’ equity | 2,225,409 | 3,637,375
Company’s share of joint ventures’ undistributed earnings | 2,175,409 | 3,587,375
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 27,873,150 | 25,896,919
Total assets | 29,690,004 | 28,798,600
Current liabilities | 10,324,510 | 9,455,475
Noncurrent liabilities | 1,198,335 | 1,616,171
Joint ventures’ equity | 18,167,159 | 17,726,954
Company’s share of joint ventures’ equity | 9,056,460 | 8,655,713
Company’s share of joint ventures’ undistributed earnings | $ 6,715,895 | $ 6,315,147

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