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Note 5 - Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Amounts recorded related to asset retirement obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(In thousands) |  | 2022 |  | 2021
Balance at beginning of year | ​ | $ | 22,549 | ​ | $ | 15,156
Additional asset retirement obligations acquired/incurred | ​ |  | 1,440 | ​ |  | 6,919
Expenditures made | ​ | ​ | — | ​ | ​ | (62)
Accretion expense | ​ |  | 1,115 | ​ |  | 615
Revisions to estimates | ​ |  | 3,781 | ​ |  | (79)
Balance at end of year | ​ | $ | 28,885 | ​ | $ | 22,549

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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