Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total Revenue, net	$ 125,206	$ 102,773
Diabetes [Member]
Total Revenue, net	69,733	59,311
Interventional Catheters [Member]
Total Revenue, net	14,572	7,361
Medical Biotelemetry Other [Member]
Total Revenue, net	14,084	12,365	[1]
Hearing Health Value Based DTEC [Member]
Total Revenue, net	3,479	4,430
Hearing Health Value Based ITEC [Member]
Total Revenue, net	8,048	5,558
Hearing Health Legacy OEM [Member]
Total Revenue, net	10,848	8,968
Professional Audio Communications [Member]
Total Revenue, net	4,442	4,780
Transferred at Point in Time [Member]
Total Revenue, net	50,114	37,774
Transferred at Point in Time [Member] | Diabetes [Member]
Total Revenue, net	0	0
Transferred at Point in Time [Member] | Interventional Catheters [Member]
Total Revenue, net	14,572	7,361
Transferred at Point in Time [Member] | Medical Biotelemetry Other [Member]
Total Revenue, net	8,725	6,677	[1]
Transferred at Point in Time [Member] | Hearing Health Value Based DTEC [Member]
Total Revenue, net	3,479	4,430
Transferred at Point in Time [Member] | Hearing Health Value Based ITEC [Member]
Total Revenue, net	8,048	5,558
Transferred at Point in Time [Member] | Hearing Health Legacy OEM [Member]
Total Revenue, net	10,848	8,968
Transferred at Point in Time [Member] | Professional Audio Communications [Member]
Total Revenue, net	4,442	4,780
Transferred over Time [Member]
Total Revenue, net	75,092	64,999
Transferred over Time [Member] | Diabetes [Member]
Total Revenue, net	69,733	59,311
Transferred over Time [Member] | Interventional Catheters [Member]
Total Revenue, net	0	0
Transferred over Time [Member] | Medical Biotelemetry Other [Member]
Total Revenue, net	5,359	5,688	[1]
Transferred over Time [Member] | Hearing Health Value Based DTEC [Member]
Total Revenue, net	0	0
Transferred over Time [Member] | Hearing Health Value Based ITEC [Member]
Total Revenue, net	0	0
Transferred over Time [Member] | Hearing Health Legacy OEM [Member]
Total Revenue, net	0	0
Transferred over Time [Member] | Professional Audio Communications [Member]
Total Revenue, net	$ 0	$ 0

[1] During the quarter ended March 31, 2020, we recorded a cumulative adjustment of $1.2 million to reduce revenue within our other medical market to correct an error related to prior periods as a result of our determination that a portion of our sales being recognized over time needed to be recognized at a point in time. The adjustment included a reduction to the related cost of goods sold of $0.8 million and related impacts to reduce the contract asset and increase to inventory. The adjustment was not material to our Consolidated Financial Statements for any quarterly or annual period.