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Note 6 - Share-based Compensation (Tables)
6 Months Ended
Jun. 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

   

Six Months Ended

 
   

June 30,

   

June 30,

 

Share-based compensation related to:

 

2020

   

2019

   

2020

   

2019

 

Common stock grants

  $ 100     $ 100     $ 200     $ 200  

Stock option grants

    54       24       113       32  

Restricted Stock Unit Awards ("RSUs")

    408       277       785       464  

Total share-based compensation

  $ 562     $ 401     $ 1,098     $ 696  
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 June 30, 2020

    94,513     $ 30.22       6.53     $ 1,308  

Exercisable at June 30, 2020

    75,871     $ 27.60       6.06     $ 1,249  

Vested and expected to vest at June 30, 2020

    94,513     $ 30.22       6.53     $ 1,308  
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

    47,509       49.36  

Shares vested

    (33,815 )     28.93  

Outstanding at June 30, 2020

    127,560     $ 33.78