Note 10 - Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Joint Pain Management	$	24,321	$	22,247	$	43,637	$	47,730
Joint Preservation and Restoration		11,884		6,622		24,103		14,518
Other		1,940		1,809		4,697		3,827
	$	38,145	$	30,678	$	72,437	$	66,075

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

	Three Months Ended June 30,
	2021					2020
	Total		Percentage of			Total		Percentage of
	Revenue		Revenue			Revenue		Revenue
Geographic Location:
United States	$	30,069		79	%	$	25,133		82	%
Europe		5,089		13	%		2,910		9	%
Other		2,987		8	%		2,635		9	%
Total	$	38,145		100	%	$	30,678		100	%

	Six Months Ended June 30,
	2021					2020
	Total		Percentage of			Total		Percentage of
	Revenue		Revenue			Revenue		Revenue
Geographic Location:
United States	$	55,074		76	%	$	51,438		78	%
Europe		10,570		15	%		8,186		12	%
Other		6,793		9	%		6,451		10	%
Total	$	72,437		100	%	$	66,075		100	%