Revenue By Market (Schedule Of Net Revenue By Market)(Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue, Major Customer [Line Items]
Total Revenue	$ 16,012	$ 17,341	$ 51,246	$ 51,063
Medical [Member]
Revenue, Major Customer [Line Items]
Total Revenue	9,256	11,122	28,816	30,018
Hearing Health [Member]
Revenue, Major Customer [Line Items]
Total Revenue	4,927	4,594	16,722	15,114
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Revenue	$ 1,829	$ 1,625	$ 5,708	$ 5,931