Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ (1,102)	$ (1,406)
Other comprehensive loss	(225)	(240)
Balance	(1,327)	(1,646)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,285)	(1,475)
Other comprehensive loss	(127)	(446)
Balance	(1,412)	(1,921)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	183	69
Other comprehensive loss	(98)	206
Balance	$ 85	$ 275