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Fair Value - Fair Value Assets and Liabilities at March 31 2013 (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Assets    
Marketable equity securities Level 1 $ 5,683,000 $ 7,093,000
Marketable equity securities Level 2      
Marketable equity securities Level 3      
Marketable equity securities Total 5,683 7,093
Liabilities    
RMB warrants Level 1      
RMB warrants Level 2 1,039,000 1,138,000
RMB warrants Level 3      
RMB warrants Total $ 1,039,000 $ 1,138,000