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Long-Term Debt And Lease Liabilities (Components Of Lease Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lease Cost [Line Items]        
Total operating lease cost $ 17 $ 15 $ 32 $ 30
Amortization of right of use assets 18 20 36 41
Interest on lease liabilities 2 2 3 3
Total finance lease cost 20 22 39 44
Production Costs And Taxes [Member]        
Lease Cost [Line Items]        
Total operating lease cost 4 3 7 6
General and Administrative [Member]        
Lease Cost [Line Items]        
Total operating lease cost $ 13 $ 12 $ 25 $ 24