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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Mar. 14, 2018
Document And Entity Information    
Entity Registrant Name SOLITARIO ZINC CORP.  
Entity Central Index Key 0000917225  
Document Type 10-K  
Document Period End Date Dec. 31, 2017  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? Yes  
Is Entity's Reporting Status Current? Yes  
Entity Filer Category Smaller Reporting Company  
Entity Public Float $ 31,861  
Entity Common Stock, Shares Outstanding   58,402,956
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2017