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Long-Term Debt And Lease Liabilities (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt And Lease Liabilities [Abstract]    
Right of use asset - operating leases $ 26 $ 41
Lease liabilities - current 26 41
Lease liabilities - noncurrent
Total operating lease liabilities 26 41
Other property and equipment, gross 264 295
Accumulated depreciation (143) (146)
Other property and equipment, net 121 149
Lease liabilities - current 56 61
Lease liabilities - noncurrent 26 41
Total finance lease liabilities $ 82 $ 102