Revenue By Market (Schedule Of Net Revenue By Market) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Total Revenue	$ 14,904	$ 13,873	$ 47,268	$ 41,584
Medical [Member]
Segment Reporting Information [Line Items]
Total Revenue	5,526	5,833	17,813	17,016
Hearing Health [Member]
Segment Reporting Information [Line Items]
Total Revenue	4,560	4,900	18,334	15,613
Professional Audio Communications [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 4,818	$ 3,140	$ 11,121	$ 8,955