Note 5 - Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	June 30,		December 31,
	2017		2016
Royalties	$	2,601	$	2,407
Collaborators		35		2,000
Other		79		457
Accounts receivable, net	$	2,715	$	4,864