Segment Reporting (Summary Of Data By Industry Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue, net	$ 30,134	$ 25,061	$ 85,657	$ 68,800
Income (loss) from continuing operations	1,903	1,079	4,679	1,029
Identifiable assets (excluding goodwill)	106,188	35,287	106,188	35,287
Goodwill	10,808	10,555	10,808	10,555	$ 10,808
Depreciation and amortization	714	554	2,146	1,659
Capital expenditures	1,888	366	3,496	984
Body Worn Devices Segment [Member]
Revenue, net	28,644	23,298	80,325	64,212
Income (loss) from continuing operations	2,942	1,283	6,671	2,114
Identifiable assets (excluding goodwill)	100,051	29,883	100,051	29,883
Goodwill	9,551	9,551	9,551	9,551
Depreciation and amortization	659	506	1,991	1,500
Capital expenditures	1,885	350	3,426	836
Hearing Health Direct-to-End Consumer [Member]
Revenue, net	1,490	1,763	5,332	4,588
Income (loss) from continuing operations	(1,039)	(204)	(1,992)	(1,085)
Identifiable assets (excluding goodwill)	6,137	5,404	6,137	5,404
Goodwill	1,257	1,004	1,257	1,004
Depreciation and amortization	55	48	155	159
Capital expenditures	$ 3	$ 16	$ 70	$ 148

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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