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Note 4 - Other Assets (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Other Assets [Table Text Block]
   
December 31,
 
   
201
9
   
201
8
 
                 
Prepaid rent
  $
3,925
    $
3,740
 
Right-of-use asset
   
59
     
-
 
Security deposits
   
134
     
133
 
    $
4,118
    $
3,873