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