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Business and Summary of Significan Accounting Policies - Results of Operations Zazu (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jul. 12, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Issuance of 19,788,177 shares of Solitario common stock		$ 13,654
Replacement options		$ 164
Investment banking and transaction costs	$ 782
Convertible debenture due Solitario, cancelled	1,510
Total purchase price	$ 16,110

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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Sale or transfer of a loan during the period resulting in a reduction in the excess of a loan's cash flows expected to be collected over the investor's initial investment. This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of fees and commissions from banking, advisory, brokerage, and securities underwriting activities. Activities include, but are not limited to, underwriting securities, private placements of securities, investment advisory and management services, merger and acquisition services, sale and servicing of mutual funds, and other related consulting fees.

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