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Investment Portfolio (Details 1) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Carrying value and income from the Partnerships    
Total partnership assets $ 118,895,434 $ 105,472,952
Total partnership liabilities 21,239,354 17,786,579
Net partnership assets 97,656,080 87,686,373
DHCM's portion of net assets 3,922,269 3,650,561
Net partnership Income 10,664,931 15,054,951
DHCM's portion of net income $ 271,448 $ 472,659