Segment Reporting (Summary Of Data By Industry Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenue, net	$ 21,961	$ 16,628	$ 42,049	$ 34,692
Income (loss) from operations	270	$ (1,262)	(266)	(981)
Identifiable assets (excluding goodwill)	35,404		35,404
Goodwill	10,555		10,555		$ 10,555
Depreciation and amortization	543		1,105	1,025
Capital expenditures	345		618	$ 1,263
Body Worn Devices [Member]
Revenue, net	20,552		39,224
Income (loss) from operations	695		612
Identifiable assets (excluding goodwill)	30,937		30,937
Goodwill	9,551		9,551
Depreciation and amortization	499		994
Capital expenditures	273		486
Hearing Health Direct-to-Consumer [Member]
Revenue, net	1,409		2,825
Income (loss) from operations	(425)		(878)
Identifiable assets (excluding goodwill)	4,467		4,467
Goodwill	1,004		1,004
Depreciation and amortization	44		111
Capital expenditures	$ 72		$ 132