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Note 5 - Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
ASSET RETIREMENT OBLIGATIONS | NOTE 5—ASSET RETIREMENT OBLIGATIONS We estimate asset retirement obligations (“ARO”) for final reclamation based upon detailed engineering calculations of the amount and timing of the future cash spending for a third-party to perform the required work. Amounts recorded related to asset retirement obligations were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2175671 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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