Note 10 - Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Joint Pain Management	$	26,153	$	18,439	$	69,790	$	66,168
Joint Preservation and Restoration		11,193		11,715		35,296		26,233
Other		2,190		1,540		6,887		5,368
	$	39,536	$	31,694	$	111,973	$	97,769

Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]

	Three Months Ended September 30,
	2021					2020
	Total		Percentage of			Total		Percentage of
	Revenue		Revenue			Revenue		Revenue
Geographic Location:
United States	$	30,910		78	%	$	26,409		84	%
Europe		4,238		11	%		2,954		9	%
Other		4,388		11	%		2,331		7	%
Total	$	39,536		100	%	$	31,694		100	%

	Nine Months Ended September 30,
	2021					2020
	Total		Percentage of			Total		Percentage of
	Revenue		Revenue			Revenue		Revenue
Geographic Location:
United States	$	85,984		77	%	$	77,848		80	%
Europe		14,808		13	%		11,140		11	%
Other		11,181		10	%		8,781		9	%
Total	$	111,973		100	%	$	97,769		100	%