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Note 6 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 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

  $ 27,711     $     $     $ 27,711  
Marketable securities                                

Corporate, municipal debt and treasury securities

    5,099                   5,099  

Total assets

  $ 32,810     $     $     $ 32,810