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Note 5 - Accounts Receivable
9 Months Ended
Sep. 30, 2017
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 collaborators, royalties, and sales of research reagents, and consisted of the following at
September 30, 2017
and
December 31, 2016 (
in thousands):
 
   
September 30,
   
December 31,
 
   
2017
   
2016
 
Royalties
  $
2,562
    $
2,407
 
Collaborators
   
10
     
2,000
 
Other
   
47
     
457
 
Accounts receivable, net
 
$
2,619
   
$
4,864