Revenue By Market (Schedule Of Net Revenue By Market) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Total Revenue	$ 12,330	$ 13,828	$ 37,935	$ 44,124
Medical [Member]
Segment Reporting Information [Line Items]
Total Revenue	5,451	5,526	17,465	17,813
Hearing Health [Member]
Segment Reporting Information [Line Items]
Total Revenue	4,986	4,560	15,213	18,334
Professional Audio Communications [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 1,893	$ 3,742	$ 5,257	$ 7,977