Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 0	$ (14)
Total accounts receivable	533	517
Revenue [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	396	479
Tax [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	129
Joint Interest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 8	23
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable		$ 29