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Note 11 - Equity Plans (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
For the years ended December 31,
 
(in thousands)
 
2018
   
2017
   
2016
 
RSU expense before taxes of New Plan
  $
643
    $
560
    $
42
 
RSU (income) expense before taxes of Old Plan
   
-
     
-
     
(73
)
RSU (income) expense after taxes
   
471
     
636
     
81
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
Number of
Shares
   
Weighted Average
Estimated Fair Value
 
Outstanding at December 31, 2017
   
469,069
    $
20.11
 
Granted
   
84,283
     
22.33
 
Converted into shares
   
(19,097
)    
16.09
 
Forfeited
   
(6,709
)    
16.98
 
Outstanding at December 31, 2018
   
527,546
    $
20.65
 
Vested at December 31, 2018
   
436,069
    $
20.42