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Note 8 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Goodwill [Table Text Block]
Balance at January 1, 2011 and 2010                                                                            
  $ 114,745  
Additional goodwill related to 2011 acquisitions
    6,305  
Goodwill impairment in 2011
    (67,000 )
Balance at December 31, 2011                                                                            
    54,050  
Additional goodwill related to acquisitions                                                                        
    360  
Goodwill adjustments
    410  
Balance at December 31, 2012                                                                            
  $ 54,820