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Subsequent Events	3 Months Ended
	Mar. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 29, 2025, DHIL’s board of directors (“Board”) approved a quarterly cash dividend of $1.50 per share, payable on June 13, 2025, to shareholders of record as of the close of business on June 2, 2025. This dividend is expected to reduce shareholders’ equity by approximately $4.1 million. On April 29, 2025, at the Company's annual meeting of shareholders, shareholders approved the Diamond Hill Investment Group, Inc. 2025 Equity and Cash Incentive Plan (the "2025 Plan"). The 2025 Plan authorizes the issuance of 225,000 DHIL common shares in various forms of equity awards. Previously, the Company issued equity awards under the 2022 Plan. With the approval of the 2025 Plan, there are no longer any common shares available for issuance under the 2022 Plan, although certain grants previously made under the 2022 Plan remain issued and outstanding.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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