Mineral Properties and Interest (Details) $ in Thousands	3 Months Ended
Mar. 31, 2026 USD ($) a patent	Dec. 31, 2025 USD ($)
Mineral Properties and Interest
Number of patented mining claims \| patent	27
Area of land covered by patented mining claims \| a	485
Mineral properties and interest \| $	$ 67,694	$ 67,680
Franco-Nevada Idaho Corporation
Mineral Properties and Interest
Percentage of net smelter returns (NSR) royalty	100.00%
Stibnite Gold Project
Mineral Properties and Interest
Percentage of net smelter returns (NSR) royalty	1.70%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 360
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477385/932-360-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii)(B)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479664/932-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479664/932-10-S99-1

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