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Mineral Properties (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance at beginning of period | $ 43,212,000 | $ 45,805,000 | $ 44,677,000
Change in estimated reclamation costs | (1,583,000) | 11,000 | 2,840,000
Acquisition costs |  | 8,000 | 31,000
Depletion and amortization | (2,445,000) | (2,601,000) | (1,743,000)
Property write-offs |  | (11,000) |
Balance at end of period | 39,184,000 | 43,212,000 | 45,805,000
Lost Creek Property [Member] |  |  |
Balance at beginning of period | 10,184,000 | 12,644,000 | 11,810,000
Change in estimated reclamation costs | (1,463,000) | 125,000 | 2,577,000
Acquisition costs |  | 0 | 0
Depletion and amortization | (2,445,000) | (2,601,000) | (1,743,000)
Property write-offs |  | 16,000 |
Balance at end of period | 6,276,000 | 10,184,000 | 12,644,000
Pathfinder Properties [Member] |  |  |
Balance at beginning of period | 19,850,000 | 19,964,000 | 19,701,000
Change in estimated reclamation costs | (120,000) | (114,000) | 263,000
Acquisition costs |  | 0 | 0
Depletion and amortization | 0 | 0 | 0
Property write-offs |  | 0 |
Balance at end of period | 19,730,000 | 19,850,000 | 19,964,000
Other U.S. Properties [Member] |  |  |
Balance at beginning of period | 13,178,000 | 13,197,000 | 13,166,000
Change in estimated reclamation costs | 0 | 0 | 0
Acquisition costs |  | 8,000 | 31,000
Depletion and amortization | 0 | 0 | 0
Property write-offs |  | (27,000) |
Balance at end of period | $ 13,178,000 | $ 13,178,000 | $ 13,197,000

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- Definition Amount of amortization of other deferred costs recognized in the income statement. + References No definition available. + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Mineral properties, net of adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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