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Note 14 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Table Text Block]
   

2019

   

2018

 
                 

Dividend yield

    2.54 %     2.56 %

Expected volatility

    20.39 %     20.17 %

Risk free interest rate

    2.52 %     2.96 %

Expected life of SARs (years)

    7.2       7.0  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three months ended September 30, 2019

 

(In thousands)

 

Stock Appreciation Rights

   

Restricted Stock Awards

   

Restricted Stock Units

   

Performance Stock Units

   

Total

 
                                         

Expense

  $ 88     $ 292     $ 82     $ 414     $ 876  

Deferred tax benefit

    (18 )     (65 )     (17 )     (109 )     (209 )

Total net expense

  $ 70     $ 227     $ 65     $ 305     $ 667  
   

Three months ended September 30, 2018

 

(In thousands)

 

Stock Appreciation Rights

   

Restricted Stock Awards

   

Restricted Stock Units

   

Performance Stock Units

   

Total

 
                                         

Expense

  $ 79     $ 280     $ 62     $ 467     $ 888  

Deferred tax benefit

    (16 )     (59 )     (13 )     (103 )     (191 )

Total net expense

  $ 63     $ 221     $ 49     $ 364     $ 697  
   

Nine months ended September 30, 2019

 

(In thousands)

 

Stock Appreciation Rights

   

Restricted Stock Awards

   

Restricted Stock Units

   

Performance Stock Units

   

Total

 
                                         

Expense

  $ 258     $ 891     $ 246     $ 1,337     $ 2,732  

Deferred tax benefit

    (54 )     (186 )     (52 )     (281 )     (573 )

Total net expense

  $ 204     $ 705     $ 194     $ 1,056     $ 2,159  
   

Nine months ended September 30, 2018

 

(In thousands)

 

Stock Appreciation Rights

   

Restricted Stock Awards

   

Restricted Stock Units

   

Performance Stock Units

   

Total

 
                                         

Expense

  $ 229     $ 831     $ 186     $ 1,677     $ 2,923  

Deferred tax benefit

    (48 )     (175 )     (39 )     (356 )     (618 )

Total net expense

  $ 181     $ 656     $ 147     $ 1,321     $ 2,305  
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block]

(In thousands)

Year ended

 

Stock Appreciation Rights

   

Restricted Stock Awards

   

Restricted Stock Units

   

Performance Stock Units

   

Total

 
                                         

Remainder of 2019

  $ 88     $ 296     $ 83     $ 381     $ 848  

2020

    306       1,037       2       853       2,198  

2021

    248       819             462       1,529  

2022

    193       550                   743  

2023

    118       304                   422  

2024

    11       24                   35  

Total estimated expense

  $ 964     $ 3,030     $ 85     $ 1,696     $ 5,775  
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, 2018

    704     $14.02 - $40.00     $ 19.51     $ 12,923     $ 3.47       5.1  

Granted

    100     35.90 - 39.32       37.75             6.07          

Exercised

    (73 )   14.02 - 19.37       15.32       1,654       3.43          

Forfeited

          -         -                      

Outstanding, December 31, 2018

    731     $14.02 - $40.00     $ 22.42     $ 8,422     $ 3.83       5.2  
                                                   

Outstanding, January 1, 2019

    731     $14.02 - $40.00     $ 22.42     $ 8,422     $ 3.83          

Granted

    53     36.65 - 38.18       37.01       2       6.24          

Exercised

    (125 )   14.02 - 22.96       16.05       2,574       3.53          

Forfeited

          -         -                      

Outstanding, September 30, 2019

    659     $14.02 - $40.00     $ 24.80     $ 8,146     $ 4.08       5.4  
                                                   

Vested and exercisable

    447     $14.02 - $40.00     $ 19.89     $ 7,575     $ 3.36       4.1  

Unvested

    212     22.96 - 40.00       35.15       571       5.58       8.2  

Outstanding, September 30, 2019

    659     $14.02 - $40.00     $ 24.80     $ 8,146     $ 4.08       5.4  
                                                   

Vested at September 30, 2019

    80     $19.37  - $40.00     $ 27.41     $ 780     $ 4.55          
Schedule of Nonvested Share Activity [Table Text Block]
           

Grant date

 
           

weighted

 

(In thousands, except per share data)

 

RSAs

   

average cost

 
                 

Unvested at January 1, 2018

    119     $ 27.62  

Shares awarded

    40       35.89  

Restrictions lapsed and shares released

    (44 )     23.62  

Shares forfeited

    (5 )     31.35  

Unvested at December 31, 2018

    110     $ 32.09  
                 

Unvested at January 1, 2019

    110     $ 32.09  

Shares awarded

    40       34.88  

Restrictions lapsed and shares released

    (40 )     28.72  

Shares forfeited

    (2 )     35.37  

Unvested at September 30, 2019

    108     $ 34.30  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   

Vesting

           

Expected

 

Grant

 

period

   

Fair

   

shares to

 

year

 

in years

   

value

   

be awarded

 

2017

    3     $ 35.66       61,893  

2018

    3       31.54       50,352  

2019

    3       32.03       43,603