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Mineral Properties (Details) | 3 Months Ended
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Mar. 31, 2022 USD ($)
Balance At Beginning Of Period | $ 35,067,000
Depletion And Amortization | 312,000
Balance At End Of Period | 34,755,000
Lost Creek Property [Member] |
Balance At Beginning Of Period | 4,527,000
Depletion And Amortization | 312,000
Balance At End Of Period | 4,215,000
Pathfinder Properties [Member] |
Balance At Beginning Of Period | 17,362,000
Depletion And Amortization | 0
Balance At End Of Period | 17,362,000
Other U.S. Properties [Member] |
Balance At Beginning Of Period | 13,178,000
Depletion And Amortization | 0
Balance At End Of Period | $ 13,178,000

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