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Note 4 - Cash, Cash Equivalents and Restricted Cash (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Table Text Block]
   
September 30,
   
December 31,
 
   
2019
   
2018
 
Cash and cash equivalents
  $
1,942
    $
1,406
 
Restricted cash
   
-
     
502
 
Cash, cash equivalents and restricted cash
  $
1,942
    $
1,908