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Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable - current | $ 294 | $ 557
Revenue [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable - current | 292 | 415
Tax [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable - current |  | 65
Tax - noncurrent |  | 65
Joint Interest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable - current | $ 2 | $ 77

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