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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 $) | Feb. 28, 2014 | Aug. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | $ 60,798,447 | $ 63,052,410
Total assets | 66,244,262 | 68,417,142
Current liabilities | 17,443,151 | 16,107,597
Noncurrent liabilities | 2,126,033 | 2,488,057
Joint ventures’ equity | 46,675,076 | 49,821,488
Company’s share of joint ventures’ equity | 22,653,729 | 24,702,981
Company’s share of joint ventures’ undistributed earnings | 20,232,259 | 22,281,510
EXCOR [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 21,138,250 | 25,955,136
Total assets | 23,578,234 | 28,391,787
Current liabilities | 3,486,865 | 3,572,004
Joint ventures’ equity | 20,091,369 | 24,819,783
Company’s share of joint ventures’ equity | 10,045,687 | 12,409,893
Company’s share of joint ventures’ undistributed earnings | 10,014,782 | 12,378,988
NTI ASEAN [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 12,498,369 | 11,200,355
Total assets | 12,520,341 | 11,226,755
Current liabilities | 3,860,391 | 3,080,118
Noncurrent liabilities | 868,005 | 871,886
Joint ventures’ equity | 7,791,945 | 7,274,751
Company’s share of joint ventures’ equity | 3,895,973 | 3,637,375
Company’s share of joint ventures’ undistributed earnings | 3,845,973 | 3,587,375
All Other [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Current assets | 27,161,828 | 25,896,919
Total assets | 30,145,687 | 28,798,600
Current liabilities | 10,095,895 | 9,455,475
Noncurrent liabilities | 1,258,028 | 1,616,171
Joint ventures’ equity | 18,791,762 | 17,726,954
Company’s share of joint ventures’ equity | 8,712,069 | 8,655,713
Company’s share of joint ventures’ undistributed earnings | $ 6,371,504 | $ 6,315,147

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