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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Carrying

  

Fair Value Measurement at September 30, 2021

 
  

Value

  

Level 1

  

Level 2

  

Level 3

 
  

(Unaudited - In thousands)

 

Cash and cash equivalents

 $64,211  $64,211  $  $ 
                 

Restricted cash equivalents

 $25  $25  $  $ 
                 

Ownership interests

 $10,792  $10,792  $  $ 
                 
  

Carrying

  

Fair Value Measurement at December 31, 2020

 
  

Value

  

Level 1

  

Level 2

  

Level 3

 
  

(Unaudited - In thousands)

 

Cash and cash equivalents

 $15,601  $15,601  $  $