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Note 3 - Property, Plant and Equipment (Tables) | 3 Months Ended
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Mar. 31, 2024
Property, Plant and Equipment. |
Schedule of property, plant, and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
(In thousands) |  | March 31, 2024 |  | December 31, 2023 | ​
Plant and equipment | ​ | $ | 296,837 | ​ | $ | 290,060 | ​
Mining property and mineral rights | ​ | ​ | 120,532 | ​ | ​ | 120,532 | ​
Construction in process | ​ |  | 23,010 | ​ |  | 13,984 | ​
Capitalized mine development costs | ​ |  | 178,171 | ​ |  | 174,260 | ​
Less: accumulated depreciation, depletion, and amortization | ​ |  | (152,297) | ​ |  | (139,745) | ​
Total property, plant, and equipment, net | ​ | $ | 466,253 | ​ | $ | 459,091 | ​
Schedule of depreciation and amortization | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, | ​
(In thousands) |  | 2024 |  | 2023 |
Depreciation of plant and equipment | ​ | $ | 8,821 | ​ | $ | 6,769 | ​
Amortization of right of use assets (finance leases) | ​ | ​ | 2,493 | ​ | ​ | 1,881 | ​
Amortization and depletion of capitalized | ​ | ​ | ​ | ​ | ​ | ​ | ​
mine development costs and mineral rights | ​ |  | 3,906 | ​ |  | 3,202 | ​
Total depreciation, depletion, and amortization | ​ | $ | 15,220 | ​ | $ | 11,852 | ​
​

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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