Discontinued Operations (Schedule Of Loss On Sale Of Discontinued Operations) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 27, 2014	Dec. 31, 2014
Cash proceeds received from Sierra Peaks		$ 500
Loss on sale of discontinued operations, net of income taxes		$ (120)
Discontinued Operations, Disposed of by Sale [Member] | Security And Certain Microphone And Receiver Operations [Member]
Accounts receivable, net	$ 384
Inventory, net	128
Property, plant and equipment, net	127
Other assets	1
Accounts payable	(69)
Net assets sold	571
Cash proceeds received from Sierra Peaks	500
Net assets sold	(571)
Transaction costs	(49)
Loss on sale of discontinued operations, net of income taxes	$ (120)