Note 7 - Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
(in thousands)	201 6		201 5
Employee related expenses	$	6,592	$	4,478
Royalties		4,423		3,498
Clinical trials		1,135		442
Professional services		387		333
Sales and use taxes payable		155		193
Other accrued liabilities		1,590		1,005
Total accrued liabilities	$	14,282	$	9,949