Investment Securities And Short-Term Investments (Schedule Of Tapout Investment ) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Investments [Line Items]
Net equity method earnings			$ 426	$ 417
Net dividends received			(175)	(418)
Equity in earnings of affiliate, net of dividends received			$ 251	$ (1)
Tapout [Member]
Schedule of Investments [Line Items]
Net equity method earnings	$ 243	$ 185
Net dividends received	22	(257)
Equity in earnings of affiliate, net of dividends received	$ 265	$ (72)