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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended March 31,

 
  

2022

  

2021

 

Stock options

  991,588   163,393 

Restricted stock units

  22,898   108,828