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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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Investment Fair Value Per Unit

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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.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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