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Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 0us-gaap_DeferredTaxAssetsValuationAllowance
Income Taxes (Textual) [Abstract]
Income tax benefit to shareholders equity	1,000,000us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity	800,000us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity	2,000,000us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity
Tax benefit not previously claimed by the company	$ 296,755dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants	$ 357,188dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants	$ 1,992,298dhil_TaxBenefitFromDividendPaymentsRelatedToRestrictedStockGrants

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- Definition

Tax benefit from dividend payments related to restricted stock grants.

+ References

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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The sum of the tax effects of all items occurring during the period that have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 740

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