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Note 5 - Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
   
Three Months Ended March 31,
 
   
2020
   
2019
 
   
(Unaudited - In thousands)
 
General and administrative expense
  $
86
    $
417
 
    $
86
    $
417