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Note 6 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Share-based compensation related to:

 

2021

  

2020

  

2021

  

2020

 

Common stock grants

 $100  $100  $200  $200 

Stock option grants

  53   54   105   113 

Restricted Stock Unit Awards ("RSUs")

  467   408   816   785 

Total share-based compensation

 $620  $562  $1,121  $1,098 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Shares Under Options

  

Weighted Average Exercise Price (per share)

  

Weighted Average Remaining Contractual Life (in years)

  

Aggregate Intrinsic Value (in thousands)

 

Outstanding at December 31, 2020

  94,513  $30.22         

Granted

  10,716   57.34         

Exercised

  (6,558)  24.77         

Outstanding at June 30, 2021

  98,671  $33.53   6.32  $2,357 

Exercisable at June 30, 2021

  87,955  $30.63   5.87  $2,356 

Vested and expected to vest at June 30, 2021

  98,671  $33.53  $6.32  $2,357 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected volatility

  33.7%

Expected dividends

 

None

 

Risk-free interest rate

  0.8%

Exercise price

 $57.34 

Expected term

 

6.2 years

 

Weighted-average grant date fair value

  19.60 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

Restricted Stock Units

  

Weighted Average
Grant Date
Fair Value

 

Outstanding at December 31, 2020

  93,187  $35.03 

Awarded

  48,952   49.76 

Shares vested

  (33,892)  32.88 

Outstanding at June 30, 2021

  108,247  $40.35