Note 15 - Segment and Geographic Information - Product Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Product revenue	$ 23,381	$ 22,278
Orthobiologics [Member]
Product revenue	20,227	19,587
Surgical [Member]
Product revenue	1,296	1,318
Dermal [Member]
Product revenue	425	381
Other [Member]
Product revenue	$ 1,433	$ 992

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration