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Short Term Debt - Short Term Debt (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
UBS short-term credit line    
Beginning balance $ 2,000 $ 1,918
Borrowing 1,200 82
Repayments (1,700)   
Ending balance 1,500 2,000
RBC short term margin loan    
Beginning balance    905
Borrowing 1,465 1,000
Repayments (1,465) (1,905)
Ending balance      
Total short-term margin loans $ 1,500 $ 2,000