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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
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Level 1 Inputs |  |
Summary of investments values based upon Level 1 and Level 2 |  |
Value of Investment | $ 62,595,546 dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | $ 32,528,367 dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 Inputs |  |
Summary of investments values based upon Level 1 and Level 2 |  |
Value of Investment | $ 14,652,589 dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 3,001,461 dhil_ValueOfInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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