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Note 13 - Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Nine months ended
 
   
September 30,
 
   
2019
    
2018
  
   
(in thousands)
  
Beginning balance
   $
72
     $
1,301
  
Additions
    
-
      
-
  
Payments
    
(59
 )    
(1,171
 )
Change in fair value included in earnings
    
(13
 )    
(24
 )
                 
Ending balance
   $
-
     $
106