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Note 13 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Year ended December 31,

 
  

2021

  

2020

  

2019

 
  

(in thousands)

 

Beginning balance

 $2,240  $1,764  $72 

Additions

  -   406   1,989 

Payments

  -   -   (309)

Change in fair value included in earnings

  (748)  70   12 
             

Ending balance

 $1,492  $2,240  $1,764