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Investment Portfolio - Summary of Partnership Investments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Carrying value and income from the Partnerships |  |  |
Total partnership assets | $ 122,106,403 | $ 105,472,952 | $ 130,880,368
Total partnership liabilities | 25,217,600 | 17,786,579 | 21,570,822
Net partnership assets | 96,888,803 | 87,686,373 | 109,309,546
DHCM’s portion of net assets | 3,001,461 | 3,650,561 | 6,977,929
Net partnership income (loss) | 24,294,495 | 15,054,951 | (11,007,617)
DHCM’s portion of net income (loss) | $ 899,958 | $ 472,659 | $ (75,082)

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