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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Carrying

   

Fair Value Measurement at September 30, 2023

 
   

Value

   

Level 1

   

Level 2

   

Level 3

 
   

(Unaudited - In thousands)

 

Cash and cash equivalents

  $ 15,660     $ 15,660     $     $  
                                 

Restricted cash

  $ 25     $ 25     $     $  
                                 
   

Carrying

   

Fair Value Measurement at December 31, 2022

 
   

Value

   

Level 1

   

Level 2

   

Level 3

 
   

(Unaudited - In thousands)

 

Cash and cash equivalents

  $ 13,331     $ 13,331     $     $  
                                 

Restricted cash

  $ 25     $ 25     $     $  
                                 

Marketable securities—held-to-maturity:

                               

U.S. Government securities

  $ 5,956     $ 5,956     $     $  
                                 

Ownership interests

  $ 860     $ 860     $     $