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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Carrying
   
Fair Value Measurement at March 31, 2020
 
   
Value
   
Level 1
   
Level 2
   
Level 3
 
   
(Unaudited - In thousands)
 
Cash and cash equivalents
  $
20,933
    $
20,933
    $
    $
 
                                 
Restricted cash equivalents
  $
25
    $
25
    $
    $
 
   
Carrying
   
Fair Value Measurement at December 31, 2019
 
   
Value
   
Level 1
   
Level 2
   
Level 3
 
   
(Unaudited - In thousands)
 
Cash and cash equivalents
  $
25,028
    $
25,028
    $
    $
 
                                 
Restricted cash equivalents
  $
25
    $
25
    $
    $