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Note 1 - Organization (Details Textual) - HIMV LLC [Member]	Aug. 06, 2025	Aug. 05, 2025
Subsidiary, Ownership Percentage, Parent	100.00%
Co-lender [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner		30.00%
Horizon Technology Finance Corporation [Member]
Subsidiary, Ownership Percentage, Parent		70.00%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_OwnershipAxis=hrzn_HIMVLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=hrzn_ColenderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=hrzn_HorizonTechnologyFinanceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: