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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Costs, expenses and other:    
Exploration expense $ 362 $ 524
Depreciation and amortization 7 14
General and administrative 627 671
Gain on derivative instruments (3) (66)
Property abandonment and impairment 10   
Interest expense    68
Interest and dividend income (54) (8)
Gain on sale of assets    (9)
Total costs, expenses and other 949 1,194
Gain on sale of marketable equity securities    332
Gain on warrant liability 99   
Net loss of equity method investment (313) (109)
Total other income (expense) (214) 223
Loss before income tax (1,163) (971)
Income tax benefit 169 109
Net loss (994) (862)
Less net loss attributable to noncontrolling interest 3 192
Net loss attributable to Solitario shareholders $ (991) $ (670)
Loss per common share attributable to Solitario shareholders:    
Basic and diluted $ (0.03) $ (0.02)
Weighted average shares outstanding:    
Basic and diluted 34,589 34,216