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Revenue Mineral Property Sale | 12 Months Ended
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Dec. 31, 2020
Revenue Recognition [Abstract] |
Revenue Mineral Property Sale | On January 22, 2019, Solitario completed the sale of its interest in certain royalties to SilverStream, discussed above. At closing of the Royalty Sale, Solitario received Cdn$250,000 in cash and the SilverStream Note in the principal amount of Cdn$350,000 and recorded mineral property revenue of $408,000 for the Royalty Sale, consisting of the fair value of the cash received on the date of the sale of $185,000 and the fair value of the SilverStream Note on the date of the sale of $263,000 less the carrying value of the royalties sold of $40,000.

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