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Note 5 - Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
   
December 31,
 
   
2019
   
2018
 
Royalties
  $
4,912
    $
3,151
 
Other
   
1,262
     
652
 
Accounts receivable, net
 
$
6,174
   
$
3,803