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Note 6 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

(In thousands)

 

Level 1

   

Level 2

   

Level 3

   

Total Fair Value

 
Cash equivalents                                

Money market accounts

  $ 17,792     $     $     $ 17,792  
Marketable securities                                

Corporate and municipal debt securities

    5,054                   5,054  

Total assets

  $ 22,846     $     $     $ 22,846