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Business and Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Apr. 26, 2018	Jul. 12, 2017
Accounting Policies [Abstract]
Sale of Yanacocha Royalty					$ 502
Mineral property revenue recorded	$ 502		$ 502
Solitario common shares issued at a rate of 0.3572 for 1 share Zazu for all issued and outstanding Zazu shares						19,788,177
Solitario stock options granted to Zazu option holders						1,782,428
Total purchase price of Zazu				$ 16,110
Current assets in United States Treasury securities	9,424		9,424
Bank certificates of deposit each with $250,000 maximum	1,247		1,247
Two Bank Certificates of Deposit in Peruvian bank	$ 450		$ 450
Potentially dilutive shares related to outstanding common stock options	4,025,228		4,025,228
Cumulative-effect adjustment for change in accounting principle		$ 576

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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