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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Property and joint venture revenue    
Joint venture property payments $ 300 $ 242
Costs, expenses and other:    
Exploration expense 1,986 5,946
Depreciation and amortization 61 46
General and administrative 2,680 2,857
Loss on derivative instruments 30 137
Property abandonment and impairment 31 10
Gain on sale of assets (8)   
Interest expense and dividend income (net) 318 163
Total costs, expenses and other 5,098 9,159
Gain on sale of marketable equity securities 1,528 1,937
Loss on warrant liability (488)   
Equity in net loss of equity method investment (488) (623)
Total other income (expense) 552 1,314
Loss before income tax (4,246) (7,603)
Income tax benefit (expense) 648 635
Net loss (3,598) (6,968)
Less net loss attributable to noncontrolling interest 301 3,591
Net loss attributable to Solitario shareholders $ (3,297) $ (3,377)
Loss per common share attributable to Solitario shareholders:    
Basic and diluted $ (0.10) $ (0.10)
Weighted average shares outstanding:    
Basic and diluted 34,351 32,807