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Note 5 - Accounts Receivable
3 Months Ended
Mar. 31, 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 sales of research reagents, and consisted of the following at
March 31, 2018
and
December 31, 2017 (
in thousands):
 
   
March 31,
   
December 31,
 
   
2018
   
2017
 
Royalties
  $
3,058
    $
3,683
 
Collaborators
   
168
     
13
 
Other
   
286
     
276
 
Accounts receivable, net
 
$
3,512
   
$
3,972