Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ (1,406)	$ (1,690)
Other comprehensive income (loss)	(50)	(96)
Balance	(1,456)	(1,786)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,475)	(1,649)
Other comprehensive income (loss)	(210)	(199)
Balance	(1,685)	(1,848)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	69	(41)
Other comprehensive income (loss)	160	103
Balance	$ 229	$ 62