Revenue By Market (Schedule Of Net Revenue By Market) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total Revenue	$ 68,303	$ 52,961	$ 59,955
Medical [Member]
Segment Reporting Information [Line Items]
Total Revenue	35,109	25,978	24,463
Hearing Health [Member]
Segment Reporting Information [Line Items]
Total Revenue	22,959	19,739	23,806
Professional Audio Communications [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 10,235	$ 7,244	$ 11,686