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Note 13 - Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Threee months ended
 
   
March 31,
 
   
2020
    
2019
  
   
(in thousands)
  
Beginning balance
   $
1,765
     $
72
  
Additions
    
-
      
-
  
Payments
    
-
      
(33
 )
Change in fair value included in earnings
    
28
      
(13
 )
                 
Ending balance
   $
1,793
     $
26