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Note 11 - Earnings Per Share Attributable to Common Stockholder (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Twelve Months Ended December 31,

 
  

2020

  

2019

  

2018

 

Service Period Stock Options

  1,355,590   1,500,156   2,018,050 

Restricted Stock Units

  190,006   235,847   213,591 

Performance Stock Options

  1,008,960   34,482   52,536 

Total

  2,554,556   1,770,485   2,284,177