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Note 5 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $)
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Condensed Income Statements, Captions [Line Items]        
Net sales     $ 88,213,101 $ 82,788,711
Gross profit     41,609,619 39,447,084
Net income     9,960,639 7,626,711
Company’s share of equity in income of joint ventures 1,593,465 1,440,335 4,416,664 3,733,069
EXCOR [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     29,020,416 26,043,775
Gross profit     15,000,023 13,624,792
Net income     5,574,387 4,954,595
Company’s share of equity in income of joint ventures     2,787,048 2,478,109
China [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     11,952,115 10,802,206
Gross profit     5,550,166 5,134,820
Net income     1,543,155 815,664
Company’s share of equity in income of joint ventures     659,684 407,809
All Other [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     47,240,570 45,942,730
Gross profit     21,059,430 20,687,472
Net income     1,913,097 1,856,452
Company’s share of equity in income of joint ventures     $ 969,932 $ 847,151