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Note 8 - Earnings Per Share Attributable to Common Stockholders (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2021

   

2020

 

Service Period Stock Options

    1,318       1,356  

Restricted Stock Units

    199       242  

Performance Stock Options

    961       34  

Total

    2,478       1,632