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Note 5 - Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
2018
   
2017
 
Royalties
  $
3,151
    $
3,683
 
Other
   
652
     
289
 
Accounts receivable, net
 
$
3,803
   
$
3,972