Note 16 - Segment and Geographic Information - Product Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Product revenue	$ 28,340	$ 26,575	$ 51,721	$ 48,853
Orthobiologics [Member]
Product revenue	24,468	23,304	44,695	42,891
Surgical [Member]
Product revenue	1,335	1,433	2,631	2,751
Dermal [Member]
Product revenue	453	582	878	963
Other [Member]
Product revenue	$ 2,084	$ 1,256	$ 3,517	$ 2,248