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Note 6 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30

  

September 30,

 

Share-based compensation related to:

 

2020

  

2019

  

2020

  

2019

 

Common stock grants

 $100  $100  $300  $300 

Stock option grants

  59   60   173   91 

Restricted Stock Unit Awards ("RSUs")

  80   313   865   778 

Total share-based compensation

 $239  $473  $1,338  $1,169 
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, 2019

  105,614  $25.34         

Granted

  14,892   43.95         

Exercised

  (25,993)  18.24         

Outstanding at September 30, 2020

  94,513  $30.22   6.28  $1,096 

Exercisable at September 30, 2020

  75,871  $27.60   5.81  $1,048 

Vested and expected to vest at September 30, 2020

  94,513  $30.22   6.28  $1,096 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected volatility

  32.8%

Expected dividends

  None 

Risk-free interest rate

  0.3%

Exercise price

 $43.95 

Expected term (in years)

  6.1 

Weighted-average grant date fair value

  14.10 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

Restricted
Stock Units

  

Weighted Average
Grant Date
Fair Value

 

Outstanding at December 31, 2019

  113,866  $28.36 

Awarded

  25,312   48.83 

Shares vested

  (33,815)  28.93 

Shares forfeited

  (11,506)  35.49 

Outstanding at September 30, 2020

  93,857