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Note 10 - Net Income Per Share (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2022

   

2021

 
   

(in thousands, except per share data)

 

Numerator:

               

Net income

  $ 25,410     $ 228  

Denominator:

               

Basic weighted average shares

    38,992       39,209  

Effect of potentially dilutive shares:

               

Stock options

    770       870  

Restricted stock units

    236       351  

Employee stock purchase plan

    3        

Diluted weighted average shares

    40,001       40,430  

Net income per share:

               

Basic

  $ 0.65     $ 0.01  

Diluted

  $ 0.64     $ 0.01  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2022

   

2021

 
   

(in thousands)

Stock options

    601       373  

Restricted stock units

          40  

Employee stock purchase plan

    8        

Total anti-dilutive shares

    609       413