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Note 2 - Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2012
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
Income statement data
 
2012
   
2011
 
             
Revenue
  $ 27,625     $ 28,642  
Gross profit
    7,023       7,366  
Net income
    2,974       3,549  
Equity in earnings of affiliated companies
    652       853  
Schedule of Variable Interest Entities [Table Text Block]
Income statement data
 
2012
   
2011
 
             
Revenue
  $ 17,252     $ 13,879  
Gross profit
    2,854       1,850  
Net income
    633       29