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Note 2 - Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
Income statement data
 
2013
   
2012
 
             
Revenue
  $ 27,949     $ 27,625  
Gross profit
    7,446       7,023  
Net income
    3,386       2,974  
Equity in earnings of affiliated companies
    902       652  
Balance Sheet [Member]
 
Schedule of Variable Interest Entities [Table Text Block]
Balance sheet data
 
2013
   
2012
 
             
Current assets
  $ 52,119     $ 65,251  
Non-current assets
    47,840       47,086  
Current liabilities
    29,086       45,604  
Non-current liabilities
    26,117       23,169  
Income Statement [Member]
 
Schedule of Variable Interest Entities [Table Text Block]
Income statement data
 
2013
   
2012
 
             
Revenue
  $ 19,272     $ 17,252  
Gross profit
    3,751       2,854  
Net income
    1,056       633