Note 11 - Revenue and Geographic Information - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 39,657	$ 38,145	$ 76,350	$ 72,437
OA Pain Management [member]
Revenue	25,741	24,321	48,474	43,637
Joint Preservation and Restoration [Member]
Revenue	12,095	11,884	24,234	24,103
Non-Orthopedic [Member]
Revenue	$ 1,821	$ 1,940	$ 3,642	$ 4,697

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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details