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Note 5 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 
  

(Unaudited - In thousands)

 

General and administrative expense

 $484  $452  $1,469  $979 
  $484  $452  $1,469  $979