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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 ($)
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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: |