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Note 7 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Stock options and SARs

 $327  $412  $1,105  $921 

Restricted stock

  545   203   1,183   566 

Performance shares

  216   114   469   303 

Total share-based compensation expense

 $1,088  $729  $2,757  $1,790 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
        Weighted Average  Aggregate 
  

No. of

  

Weighted Average

  

Remaining Life

  

Intrinsic Value

 
  

Shares

  

Exercise Price

  

(in years)

  

(in thousands)

 

Outstanding, January 1, 2021

  970,022  $12.92   3.74  $11,128 

Granted(1)

  143,543   25.02         

Exercised

  (262,960)  10.10         

Lapsed or cancelled

  (19,126)  14.90         

Outstanding, September 30, 2021

  831,479   15.86   3.43   6,487 

Exercisable, September 30, 2021

  487,161   14.66   2.83   4,231 
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block]
        Weighted Average  Aggregate 
  

No. of

  

Weighted Average

  

Remaining Life

  

Intrinsic Value

 
  

Shares

  

Exercise Price

  

(in years)

  

(in thousands)

 

Outstanding, January 1, 2021

  317,128  $13.47   3.36  $2,031 

Granted(1)

  31,687   25.75         

Exercised

  (26,438)  14.74         

Outstanding, September 30, 2021

  322,377   14.57   2.88   2,899 

Exercisable, September 30, 2021

  160,586   15.29   2.20   1,296 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
      

Weighted Average

 
  

No. of

  

Grant Date

 
  

Shares

  

Fair Value

 

Outstanding, January 1, 2021

  157,244  $16.84 

Granted

  264,166   23.16 

Vested

  (24,908)  23.55 

Outstanding, September 30, 2021

  396,502   20.63 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
      

Weighted Average

 
  

No. of

  

Grant Date

 
  

Shares

  

Fair Value

 

Outstanding, January 1, 2021

  186,264  $18.28 

Granted

  116,405   22.13 

Vested

  (57,255)  17.54 

Forfeited

  (36,141)  15.19 

Outstanding, September 30, 2021

  209,273   21.16