Segment Reporting (Summary Of Data By Industry Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, net	$ 68,009	$ 68,527	$ 67,094
Income (loss) from operations	(2,974)	3,082	3,389
Identifiable assets (excluding goodwill)	33,203	32,335
Goodwill	10,555	9,551	9,194	$ 9,194
Depreciation and amortization	2,041	1,755	2,182
Capital expenditures	1,766	3,982	$ 1,524
Body Worn Devices [Member]
Revenue, net	66,984	68,527
Income (loss) from operations	(2,957)	3,082
Identifiable assets (excluding goodwill)	29,048	32,335
Goodwill	9,551	9,551
Depreciation and amortization	2,041	1,755
Capital expenditures	1,766	$ 3,982
Hearing Health Direct-to-Consumer [Member]
Revenue, net	1,025
Income (loss) from operations	(17)
Identifiable assets (excluding goodwill)	4,155
Goodwill	$ 1,004