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Note 5 - Accounts Receivable
9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Note
5
. Accounts Receivable
 
Our accounts receivable represent amounts due to us from royalties, collaborators, and, to a small extent, sales of research reagents, and consisted of the following at
September 30, 2018
and
December 31, 2017 (
in thousands):
 
   
September 30,
   
December 31,
 
   
2018
   
2017
 
Royalties
  $
5,169
    $
3,683
 
Other
   
652
     
289
 
Accounts receivable, net
 
$
5,821
   
$
3,972