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Note 6 - Other Current Assets (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Other Current Assets [Table Text Block]
     
2019
   
2018
 
Income tax receivable
  $
5,091
    $
5,087
 
Prepaid expense
   
2,948
     
3,878
 
Other
   
2,635
     
3,204
 
Total prepayments and other current assets
  $
10,674
    $
12,169