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Note 13 - Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Year ended December 31,
  
   
2018
    
2017
    
2016
  
   
(in thousands)
  
Beginning balance
   $
1,300
     $
1,320
     $
-
  
Additions
    
-
      
-
      
1,301
  
Payments
    
(1,199
 )    
(126
 )    
(68
 )
Change in fair value included in earnings
    
(29
 )    
106
      
87
  
                         
Ending balance
   $
72
     $
1,300
     $
1,320