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Description Of Business And Significant Accounting Policies (Narrative) (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 25, 2021 | Mar. 21, 2016 | Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($)
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Unevaluated properties |  |  | $ 0 | $ 0
Current cost discount |  |  | 10.00% |
Stock based compensation |  |  | $ 14,000 | 17,000
Deferred tax asset |  |  |  | 65,000
Derivatives |  |  | $ 0 | 0
Customers | customer |  |  | 2 |
Impairment |  |  | $ 920,000 | 0
Accounts receivable - noncurrent |  |  |  | 65,000
Allowance for doubtful accounts |  |  | $ 0 | $ 0
Reverse stock split |  | 0.1 |  |
Customer A [Member] | Revenue [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Customer's percentage of revenue |  |  | 84.70% | 87.70%
Customer B [Member] | Revenue [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Customer's percentage of revenue |  |  | 11.10% | 11.80%
Customer C [Member] | Accounts Receivable [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Customer's percentage of revenue |  |  | 83.90% | 76.90%
Two Customers [Member] | Accounts Receivable [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Customer's percentage of revenue |  |  | 96.80% | 86.00%
Subsequent Event [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Reverse stock split | 0.083 |  |  |

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