Long-Term Debt And Lease Liabilities (Maturity Analysis For Operating and Finance Lease Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long-Term Debt And Lease Liabilities [Abstract]
2020	$ 26
Total lease payments	26
Total operating lease liabilities	26	$ 41
2020	44
2021	39
Total lease payments	83
Less imputed interest	(1)
Total finance lease liabilities	$ 82	$ 102