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v3.26.1

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

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- 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: |