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Note 12 - Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
For the years ended December 31,
 
(in thousands)
  
2019
    
2018
    
2017
  
RSU expense before taxes of the Plan
   $
965
     $
643
     $
560
  
RSU expense after taxes
    
704
      
471
      
636
  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
2019
    
2018
    
2017
  
   
Number of
Shares
    
Weighted
Average
Estimated
Fair Value
    
Number of
Shares
    
Weighted
Average
Estimated
Fair Value
    
Number of
Shares
    
Weighted
Average
Estimated
Fair Value
  
Beginning balance
    
527,546
     $
20.65
      
469,069
     $
20.11
      
421,486
     $
19.93
  
Granted
    
207,521
      
16.36
      
84,283
      
22.33
      
73,021
      
20.01
  
Converted into shares
    
(96,845
 )    
20.59
      
(19,097
 )    
16.09
      
(25,438
 )    
16.71
  
Forfeited
    
(2,136
 )    
22.80
      
(6,709
 )    
16.98
      
-
      
-
  
Outstanding at December 31
    
636,086
     $
19.25
      
527,546
     $
20.65
      
469,069
     $
20.11
  
Vested at December 31
    
419,721
     $
20.37
      
436,069
     $
20.42
      
403,428
     $
19.89