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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended March 31,

 
  

2023

  

2022

 

Stock options

  1,216,055   991,588 

Restricted stock units

  25,555   22,898