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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
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