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Note 4 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
  

Number of stock awards (in thousands)

  

Weighted average grant date fair value

 
         

Unvested at December 31, 2019

  787  $18.25 
         

Granted

  119  $13.43 

Vested

  (65) $23.82 

Forfeited

  (196) $20.05 

Unvested at December 31, 2020

  645  $16.25 
         

Granted

  252  $21.34 

Vested

  (218) $16.57 

Forfeited

  (117) $15.31 

Unvested at December 31, 2021

  562  $18.12 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Number of options (in thousands)

  

Weighted average exercise price

  

Weighted average remaining contractual term

  

Aggregate intrinsic value (in thousands)

 
                 

Outstanding at December 31, 2019

  -  $-   -  $- 
                 

Options granted

  721  $15.77         

Options exercised

  -  $-         

Options forfeited

  -  $-         

Outstanding at December 31, 2020

  721  $15.77  

9.8 years

  $(692)
                 

Options granted

  450  $21.24         

Options exercised

  -  $-         

Options forfeited

  (60) $15.77         

Outstanding at December 31, 2021

  1,111  $17.99  

9.0 years

  $9,382 
                 

Exercisable at December 31, 2021

  -  $-   -  $-