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Note 6 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and Tianjin Zerust, and All Other Joint Ventures - USD ($)
 3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Condensed Income Statements, Captions [Line Items]        
Net sales     $ 75,974,770 $ 88,213,101
Gross profit     37,469,186 41,609,619
Net income     9,634,318 9,960,639
Company’s share of equity in income of joint ventures $ 1,724,915 $ 1,593,465 4,806,247 4,416,664
EXCOR [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales     27,580,051 29,020,416
Gross profit     15,113,100 15,000,023
Net income     6,334,009 5,574,387
Company’s share of equity in income of joint ventures     3,152,489 2,787,048
Tianjin Zerust [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales     3,735,457 11,952,115
Gross profit     1,783,673 5,550,166
Net income     265,648 1,543,155
Company’s share of equity in income of joint ventures     132,824 659,684
All Other [Member]        
Condensed Income Statements, Captions [Line Items]        
Net sales     44,659,262 47,240,570
Gross profit     20,572,413 21,059,430
Net income     3,034,661 1,913,097
Company’s share of equity in income of joint ventures     $ 1,520,934 $ 969,932