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Note 15 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Table Text Block]

Assumptions

 

2020

   

2019

 
                 

Dividend yield

    2.51 %     2.52 %

Expected volatility

    20.87 %     20.40 %

Risk free interest rate

    1.25 %     2.55 %

Expected life of SARs (in years)

    7.1       7.2  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three months ended March 31, 2020

 

(in thousands)

 

Stock

Appreciation

Rights

   

Restricted

Stock Awards

   

Restricted

Stock Units

   

Performance

Stock Units

   

Total

 
                                         

Expense

  $ 90     $ 325     $ 67     $ 335     $ 817  

Deferred tax benefit

    (19 )     (68 )     (14 )     (71 )     (172 )

Total net expense

  $ 71     $ 257     $ 53     $ 264     $ 645  
   

Three months ended March 31, 2019

 

(in thousands)

 

Stock

Appreciation

Rights

   

Restricted

Stock Awards

   

Restricted

Stock Units

   

Performance

Stock Units

   

Total

 
                                         

Expense

  $ 84     $ 293     $ 81     $ 405     $ 863  

Deferred tax benefit

    (18 )     (61 )     (17 )     (85 )     (181 )

Total net expense

  $ 66     $ 232     $ 64     $ 320     $ 682  
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
(in thousands)   Stock                          

Year ended

 

Appreciation

Rights

   

Restricted

Stock Awards

   

Restricted

Stock Units

   

Performance

Stock Units

   

Total

 
                                         

Remainder of 2020

  $ 263     $ 958     $ 202     $ 1,007     $ 2,430  

2021

    304       1,094       1       952       2,351  

2022

    249       826             490       1,565  

2023

    174       582                   756  

2024

    68       306                   374  

2025

    9       29                   38  

Total estimated expense

  $ 1,067     $ 3,795     $ 203     $ 2,449     $ 7,514  
Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]
                                             

Weighted

 
                     

Weighted

           

Weighted

   

average

 
                     

average

   

Aggregate

   

average

   

remaining

 
           

Exercise

   

exercise

   

intrinsic

   

fair

   

contractual

 

(in thousands, except per share data)

 

SARs

   

price

   

price

   

value(1)

   

value

   

life (in years)

 
                                                   

Outstanding, January 1, 2019

    731     $14.02 -

$40.00

    $ 22.42     $ 8,422     $ 3.83       5.2  

Granted

    53     36.65 - 38.18       37.01       213       6.24          

Exercised

    (143 )   14.02 - 22.96       15.99       3,025       3.47          

Forfeited

                                       

Outstanding, December 31, 2019

    641     $14.02 -

$40.00

    $ 25.06     $ 10,250     $ 4.10       5.3  
                                                   

Outstanding, January 1, 2020

    641     $14.02 -

$40.00

    $ 25.06     $ 10,250     $ 4.10       5.3  

Granted

    48     37.30 - 37.30       37.30             5.80          

Exercised

    (4 )   14.02 - 15.24       14.52       115       3.16          

Forfeited

                                       

Outstanding, March 31, 2020

    685     $15.24 -

$40.00

    $ 25.99     $ 4,243     $ 4.23       5.4  
                                                   

Vested and exercisable

    490     $15.24 -

$40.00

    $ 21.69     $ 4,191     $ 3.60       4.1  

Unvested

    195     24.56 - 40.00       36.77       52       5.80       8.5  

Outstanding, March 31, 2020

    685     $15.24 -

$40.00

    $ 25.99     $ 4,243     $ 4.23       5.4  
                                                   

Vested at March 31, 2020

    55     $22.96 -

$40.00

    $ 30.46     $ 132     $ 5.02          
Schedule of Nonvested Share Activity [Table Text Block]
           

Grant date

 
           

weighted

 

(in thousands, except per share data)

 

RSAs

   

average cost

 
                 

Unvested at January 1, 2019

    110     $ 32.09  

Shares awarded

    40       34.88  

Restrictions lapsed and shares released

    (40 )     28.74  

Shares forfeited

    (2 )     35.36  

Unvested at December 31, 2019

    108     $ 34.31  
                 

Unvested at January 1, 2020

    108     $ 34.31  

Shares awarded

    36       39.30  

Restrictions lapsed and shares released

    (37 )     32.06  

Shares forfeited

    (1 )     36.87  

Unvested at March 31, 2020

    106     $ 36.80  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   

Vesting

           

Expected

 

Grant

 

period

   

Fair

   

shares to

 

year

 

in years

   

value

   

be awarded

 

2018

    3     $ 31.54       50,352  

2019

    3       32.03       43,603  

2020

    3       32.27       45,577