Revenue By Market (Schedule Of Net Revenue By Market) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue, Major Customer [Line Items]
Total Revenue	$ 17,341	$ 17,005	$ 51,063	$ 51,822
Medical [Member]
Revenue, Major Customer [Line Items]
Total Revenue	11,122	8,664	30,018	27,377
Hearing Health [Member]
Revenue, Major Customer [Line Items]
Total Revenue	4,594	5,533	15,114	17,009
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Revenue	$ 1,625	$ 2,808	$ 5,931	$ 7,436