Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Computed "Expected" Federal Tax Expense (Benefit From)	$ (36)	$ 39
State Income Taxes, net of Federal Benefit	1	1
R&D Credits	(7)	(72)
Permanent Differences	1	5
Other	(7)	26
Total Federal and State Income Taxes	(48)	(1)
Accrued interest or penalties related to uncertain tax positions	$ (0)	$ 0