Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Gross unrecognized tax benefits at January 1	$ 223,455	$ 223,216
Increases in tax positions for prior years	4,467	333
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(328)	(196)
Increases in tax positions for current year	3,745	436
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	(334)
Gross unrecognized tax benefits at December 31	$ 231,339	$ 223,455