Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ (1,102)	$ (1,406)
Other comprehensive loss	(409)	(50)
Balance	(1,511)	(1,456)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,285)	(1,475)
Other comprehensive loss	(285)	(210)
Balance	(1,570)	(1,685)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	183	69
Other comprehensive loss	(124)	160
Balance	$ 59	$ 229