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Note 3 - Related Party Transactions - Expiration Dates of Contingent Future Liability (Details) - Investment Management Agreement [Member] $ in Thousands	Mar. 31, 2025 USD ($)
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	$ 22,313
December 31, 2025 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	1,037
March 31, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	219
June 30, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,120
September 30, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,471
December 31, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,002
March 31, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,285
June 30, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,582
September 30, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,368
December 31, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,085
March 31, 2028 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	$ 2,144

X

- Definition

Amount of contingent future liability from Incentive Fee Cap and Deferral Mechanism.

+ References

No definition available.

+ Details

Name:	hrzn_IncentiveFeeCapAndDeferralMechanismContingentFutureLiability
Namespace Prefix:	hrzn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=hrzn_InvestmentManagementAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_December312025ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_March312026ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_June302026ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_September302026ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_December312026ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_March312027ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_June302027ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_September302027ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_December312027ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=hrzn_March312028ExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: