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Investment Portfolio (Details 1) (USD $) | 12 Months Ended
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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

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