Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Gross unrecognized tax benefits at January 1	$ 223,216	$ 220,682
Increases in tax positions for prior years	333	3,699
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(196)	(144)
Increases in tax positions for current year	436	395
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	(1,416)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(334)	0
Gross unrecognized tax benefits at December 31	$ 223,455	$ 223,216