Revenue By Market (Schedule Of Net Revenue By Market)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue, Major Customer [Line Items]
Total Revenue	$ 16,976	$ 17,120	$ 35,234	$ 33,722
Medical [Member]
Revenue, Major Customer [Line Items]
Total Revenue	9,527	9,939	19,560	18,896
Hearing Health [Member]
Revenue, Major Customer [Line Items]
Total Revenue	5,327	4,956	11,795	10,520
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Revenue	$ 2,122	$ 2,225	$ 3,879	$ 4,306