Revenue By Market (Schedule Of Net Revenue By Market)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue, Major Customer [Line Items]
Total Revenue	$ 20,088	$ 18,064
Medical [Member]
Revenue, Major Customer [Line Items]
Total Revenue	11,671	9,839
Hearing Health [Member]
Revenue, Major Customer [Line Items]
Total Revenue	5,619	6,468
Hearing Health - Direct To Customer [Member]
Revenue, Major Customer [Line Items]
Total Revenue	1,416
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Revenue	$ 1,382	$ 1,757