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Fair Value - Fair Value Disclosure (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Assets    
Marketable equity securities Level 1 $ 4,210,000 $ 3,973,000
Marketable equity securities Level 2      
Marketable equity securities Level 3      
Marketable equity securities Total 4,210,000 3,973,000
Liabilities    
RMB warrants Level 1      
RMB warrants Level 2 400,000 140,000
RMB warrants Level 3      
RMB warrants Total 400,000 140,000
Kinross calls Level 1 7,000 3,000
Kinross calls Level 2      
Kinross calls Level 3     
Kinross calls Total $ 7,000 $ 3,000