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Gold and Silver Rounds/Bullion (Details) $ in Thousands | Sep. 30, 2021 USD ($) oz $ / oz | Dec. 31, 2020 USD ($) oz $ / oz
--- | --- | ---
Schedule of Investments [Line Items] |  |
Total carrying value | $ 559 | $ 671
Gold |  |
Schedule of Investments [Line Items] |  |
Ounces | oz | 176 | 189
Carrying value per ounce | $ / oz | 1,743 | 1,888
Total carrying value | $ 307 | $ 357
Silver |  |
Schedule of Investments [Line Items] |  |
Ounces | oz | 11,715 | 11,842
Carrying value per ounce | $ / oz | 21.53 | 26.49
Total carrying value | $ 252 | $ 314

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