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Note 4 - Other Assets (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Other Assets [Table Text Block]
   
December 31,
 
   
201
7
   
201
6
 
                 
Prepaid rent
  $
3,554
    $
3,369
 
Security deposits
   
392
     
133
 
    $
3,946
    $
3,502