Note 3 - Revenue - Product Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 30,418	$ 30,548	$ 55,141	$ 51,812
Orthobiologics [Member]
Revenue	26,462	26,192	48,210	45,681
Surgical [Member]
Revenue	2,101	1,263	3,493	2,509
Dermal [Member]
Revenue	444	623	573	83
Manufactured Product, Other [Member]
Revenue	1,406	2,464	2,854	3,527
Product [Member]
Revenue	$ 30,413	$ 30,542	$ 55,130	$ 51,800

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration