Subsequent Event	12 Months Ended
Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	13. Subsequent Event The financial statements and related disclosures include an evaluation of events leading up through and including February 28, 2019, which is the date the financial statements were issued. On January 22, 2019, Solitario announced the sale of its interests in a retained royalty on the Pedra Branca project in Brazil, a retained royalty on non-producing exploration properties in Mexico, and a royalty on certain non-producing mineral claims in Montana to SilverStream for Cdn$250,000 in cash and a one-year note from SilverStream for Cdn$350,000.

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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