Gold and Silver Rounds (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2021
USD ($)
oz
$ / oz
|
Dec. 31, 2020
USD ($)
oz
$ / oz
|
|
| Schedule of Investments [Line Items] | ||
| Total carrying value | $ 589,000 | $ 671,000 |
| Gold | ||
| Schedule of Investments [Line Items] | ||
| Ounces sold | 1 | 1,641 |
| Additional ounces | 12 | |
| Ounces | oz | 176 | 189 |
| Carrying value per ounce | $ / oz | 1,820 | 1,888 |
| Total carrying value | $ 320,000 | $ 357,000 |
| Silver | ||
| Schedule of Investments [Line Items] | ||
| Ounces sold | 39 | 67,560 |
| Additional ounces | 148 | |
| Ounces | oz | 11,655 | 11,842 |
| Carrying value per ounce | $ / oz | 23.09 | 26.49 |
| Total carrying value | $ 269,000 | $ 314,000 |
| Gold And Silver | ||
| Schedule of Investments [Line Items] | ||
| Other Income | $ 2,000 | $ 1,000,000.0 |