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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Asset Retirement Obligations [Table Text Block] |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Balance, beginning of year |  | $ | 15,764 |  |  | $ | 14,646 |
Accretion |  |  | 1,381 |  |  |  | 1,272 |
Revisions |  |  | — |  |  |  | 95 |
Payments |  |  | (868 | ) |  |  | (249 | )
Balance, end of year |  |  | 16,277 |  |  |  | 15,764 |
Less current portion |  |  | (100 | ) |  |  | (70 | )
Long-term balance, end of year |  | $ | 16,177 |  |  | $ | 15,694 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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