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Note 4 - Cash (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
   
September 30
,
   
December 31,
 
   
2018
   
2017
 
Cash
  $
25,013
    $
18,241
 
Restricted Cash
   
441
     
89
 
Total
  $
25,454
    $
18,330