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Note 2 - Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
Income statement data
 
2012
   
2011
 
             
Revenue
  $ 102,407     $ 101,387  
Gross profit
    28,620       22,098  
Net income
    15,382       9,627  
Equity in earnings of affiliated companies
    4,389       2,531  
Balance Sheet [Member]
 
Schedule of Variable Interest Entities [Table Text Block]
Balance sheet data
 
2012
   
2011
 
             
Current assets
  $ 61,723     $ 40,525  
Non-current assets
    40,420       19,005  
Current liabilities
    42,189       23,566  
Income Statement [Member]
 
Schedule of Variable Interest Entities [Table Text Block]
Income statement data
 
2012
   
2011
 
             
Revenue
  $ 74,313     $ 36,241  
Gross profit
    11,361       4,650  
Net income (loss)
    1,391       (1,132 )