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Investment Portfolio (Details 1) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Carrying value and income from the Partnerships    
Total partnership assets $ 102,336,078 $ 130,880,368
Total partnership liabilities 16,773,171 21,570,822
Net partnership assets 85,562,907 109,309,546
DHCM's portion of net assets 3,644,102 6,977,929
Net Partnership Income (loss) 11,548,485 (11,007,617)
DHCM's portion of net income (loss) $ 466,201 $ (75,082)