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Note 8 - Earnings Per Share Attributable to Common Stockholder (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2022

  

2021

 

Service Period Stock Options

  1,262   1,318 

Restricted Stock Units

  167   199 

Performance Stock Options

  956   961 

Total

  2,385   2,478