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Mineral Properties - Mineral Properties Capitalized Development Costs (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Notes to Financial Statements        
Development expenditures $ 355,000 $ 441,000 $ 840,000 $ 768,000
Capitalized interest 149,000 193,000 302,000 373,000
Property payments 100,000 100,000 100,000 100,000
Capitalized depreciation 8,000 8,000 16,000 16,000
Total capitalized costs $ 612,000 $ 742,000 $ 1,258,000 $ 1,257,000