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Note 3 - Related Party Transactions - Expiration Dates of Contingent Future Liability (Details) - Investment Management Agreement [Member] $ in Thousands | Jun. 30, 2026 USD ($)
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Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | $ 25,431
June 30, 2026 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 3,471
September 30, 2026 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 3,002
December 31, 2026 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,285
March 31, 2027 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,582
June 30, 2027 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,368
September 30, 2027 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,085
December 31, 2027 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,144
March 31, 2028 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,290
June 30, 2028 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 2,799
September 30, 2028 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 1,650
December 31, 2028 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | 382
March 31, 2029 Expiration [Member] |
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability | $ 373

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_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: |

X
- Details
Name: | srt_StatementScenarioAxis=hrzn_June302028ExpirationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=hrzn_September302028ExpirationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=hrzn_December312028ExpirationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=hrzn_March312029ExpirationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |