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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Stock options

  384,444   1,796,478   317,909   1,769,556 

Restricted stock units

  35,275   35,123   68,341   46,851