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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
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