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Note 5 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Activity [Table Text Block]
   

Three Months Ended September 30,

   

Nine Months Ended September 30,

 
   

2023

   

2022

   

2023

   

2022

 
   

(Unaudited - In thousands)

 

General and administrative expense

  $ 238     $ 560     $ 808     $ 1,136  
    $ 238     $ 560     $ 808     $ 1,136