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Investment Portfolio (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Carrying value and income from the Partnerships      
Total partnership assets $ 105,472,952 $ 130,880,368 $ 173,007,238
Total partnership liabilities 17,786,579 21,570,822 32,855,190
Net partnership assets 87,686,373 109,309,546 140,152,048
DHCM's portion of net assets 3,650,561 6,977,929 10,261,062
Net partnership Income (loss) 15,054,951 (11,007,617) 4,486,719
DHCM's portion of net income (loss) $ 472,659 $ (75,082) $ 939,265