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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Costs, expenses and other:    
Exploration expense $ 48 $ 362
Depreciation and amortization 3 7
General and administrative 531 627
Gain on derivative instruments (32) (3)
Property abandonment and impairment    10
Interest and dividend income    (54)
Total costs, expenses and other 550 949
Gain on sale of marketable equity securities 300   
(Loss) gain on warrant liability (260) 99
Net loss of equity method investment (125) (313)
Total other income (expense) (85) (214)
Loss before income tax (635) (1,163)
Income tax benefit 100 169
Net loss (535) (994)
Less net loss attributable to noncontrolling interest 3 3
Net loss attributable to Solitario shareholders $ (532) $ (991)
Loss per common share attributable to Solitario shareholders:    
Basic and diluted $ (0.01) $ (0.03)
Weighted average shares outstanding:    
Basic and diluted 38,130 34,589