Note 5 - Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	March 31,		December 31,
	2017		2016
Royalties	$	1,847	$	2,407
Collaborators		202		2,000
Other		48		457
Accounts receivable, net	$	2,097	$	4,864