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Mineral Properties - Capitalized Development Costs (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Notes to Financial Statements        
Development expenditures $ 441,000 $ 543,000 $ 768,000 $ 763,000
Capitalized interest 193,000    373,000   
Property payments 100,000 160,000 100,000 275,000
Capitalized depreciation 8,000 6,000 16,000 6,000
Total capitalized costs $ 742,000 $ 709,000 $ 1,257,000 $ 1,044,000