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Note 8 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2024
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:

 

2024

   

2023

   

2024

   

2023

 

Common stock grants

  $ 100     $ 100     $ 300     $ 300  

Stock option grants

    127       112       357       320  

Restricted Stock Unit Awards ("RSUs")

    1,312       985       4,130       2,830  

Total share-based compensation

  $ 1,539     $ 1,197     $ 4,787     $ 3,450  
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, 2023

    78,488     $ 39.98                  

Granted

    2,958       260.92                  

Exercised

    (6,568 )     32.35                  

Outstanding at September 30, 2024

    74,878     $ 67.67       5.17     $ 18,669  

Exercisable at September 30, 2024

    67,952     $ 56.36       5.08     $ 17,690  

Vested and expected to vest at September 30, 2024

    74,878     $ 67.67       5.17     $ 18,669  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected volatility

    39.7 %

Expected dividends

 

None

 

Risk-free interest rate

    4.3 %

Exercise price

  $ 260.92  

Expected term

    6.3  

Weighted-average grant date fair value

  $ 121.61  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   

Restricted

Stock Units

   

Weighted Average
Grant Date
Fair Value

 

Outstanding at December 31, 2023

    95,693     $ 64.82  

Awarded

    31,663       175.30  

Shares vested

    (50,582 )     79.53  

Shares forfeited

    (559 )     135.81  

Outstanding at September 30, 2024

    76,215     $ 95.82