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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

June 30, 2022

  

December 31, 2021

 
  

Quoted Prices in

      

Quoted Prices in

     
  

Active Markets

      

Active Markets

     
  

for Identical

      

for Identical

     
  

Assets (Level 1)

  

Total

  

Assets (Level 1)

  

Total

 

Assets

                

Cash equivalents:

                

Money market funds

 $32,161  $32,161  $37,023  $37,023 

Total cash equivalents

  32,161   32,161   37,023   37,023 

Restricted cash:

                

Money market funds

  221   221   557   557 

Total assets measured at fair value

 $32,382  $32,382  $37,580  $37,580