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Note 4 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements at

 
  

December 31, 2021

 
  

Total

  

Level 1

 

Assets

        

Money market funds

 $49,217  $49,217 
  

Fair Value Measurements at

 
  

December 31, 2020

 
  

Total

  

Level 1

 

Assets

      - 

Money market funds

 $49,207  $49,207