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Significant Accounting Policies - Summary of Fair Value Based Upon Level 1 and Level 2 Inputs (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Level 1 Inputs
Summary of investments values based upon Level 1 and Level 2
Value of Investment	$ 62,595,546dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	$ 32,528,367dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 Inputs
Summary of investments values based upon Level 1 and Level 2
Value of Investment	$ 14,652,589dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	$ 3,001,461dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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