XML 32 R24.htm IDEA: XBRL DOCUMENT v2.4.0.6

Significant Accounting Policies (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Level 1 Inputs [Member]
Summary of investments valued based upon Level 1 and Level 2
Value of Investment	$ 32,589,375	$ 10,480,353
Level 2 Inputs [Member]
Summary of investments valued based upon Level 1 and Level 2
Value of Investment	$ 3,644,102	$ 6,977,929

X

- Details

Name:	dhil_SummaryOfInvestmentsValuesBasedUponLevel1AndLevel2
Namespace Prefix:	dhil_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of investment.

+ References

No definition available.

+ Details

Name:	dhil_ValueOfInvestment
Namespace Prefix:	dhil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant