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Note 15 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 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%  2.54%

Expected volatility

  20.87%  20.39%

Risk free interest rate

  1.25%  2.52%

Expected life (in years)

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

Three months ended September 30, 2020

 

(in thousands)

 

Stock

Appreciation

Rights

  

Restricted

Stock Awards

  

Restricted

Stock Units

  

Performance

Stock Units

  

Total

 
                     

Expense

 $88  $424  $67  $264  $843 

Deferred tax benefit

  (19)  (90)  (14)  (56)  (179)

Total net expense

 $69  $334  $53  $208  $664 
  

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 
  

Nine months ended September 30, 2020

 

(in thousands)

 

Stock

Appreciation

Rights

  

Restricted

Stock Awards

  

Restricted

Stock Units

  

Performance

Stock Units

  

Total

 
                     

Expense

 $265  $1,064  $202  $1,105  $2,636 

Deferred tax benefit

  (56)  (223)  (42)  (231)  (552)

Total net expense

 $209  $841  $160  $874  $2,084 
  

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 
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 2020

 $88  $291  $68  $190  $637 

2021

  304   1,002   1   760   2,067 

2022

  249   769      490   1,508 

2023

  174   550         724 

2024

  68   295         363 

2025

  9   28         37 

Total estimated expense

 $892  $2,935  $69  $1,440  $5,336 
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

  (95) 14.02-25.76   16.32   2,361   2.87     

Forfeited

                    

Outstanding, September 30, 2020

  594  $15.24-

$40.00

  $27.45  $4,878  $4.44   5.4 
                          

Vested and exercisable

  402  $15.24-

$40.00

  $23.00  $4,745  $3.78   4.1 

Unvested

  192  25.76-40.00   36.77   133   5.81   8.0 

Outstanding, September 30, 2020

  594  $15.24-

$40.00

  $27.45  $4,878  $4.44   5.4 
                          

Vested in the current year

  58  $22.96-

$40.00

  $30.79  $286  $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

  (41)  32.39 

Shares forfeited

  (3)  36.53 

Unvested at September 30, 2020

  100  $36.83 
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   36,127 

2020

  3   32.27   45,577