XML 76 R60.htm IDEA: XBRL DOCUMENT
v3.26.1

Note 13 - MRCC Merger (Details Textual) - MRCC Merger [Member] $ in Millions | Apr. 14, 2026 USD ($) shares
--- | ---
Cash Acquired from Acquisition | $ 141.3
Asset Acquisition, Number of Shares Issued (in shares) | shares | 20,370,645
Asset Acquistion, Number of Shares Issued For Each Share of Acquiree's Common Stock (in shares) | shares | 0.9402
Asset Acquisition, Percentage Owned After Merger by Former Stockholders of Acquiree | 29.86%
Asset Acquisition, Percentage Owned After Merger by Legacy Stockholders | 70.14%
Asset Acquisition, Consideration Transferred, Transaction Cost | $ 4.4
Base Management and Incentive Fees Waived | 4.0
Base Management and Incentive Fees, Amount Waived per Quarter | $ 1.0

X
- Definition Represents the number of shares transferred in an asset acquisition. + References No definition available. + Details
Name: | hrzn_AssetAcquisitionNumberOfSharesIssued
Namespace Prefix: | hrzn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of shares issued for each share of the acquiree's common stock in relation to an asset acquisition. + References No definition available. + Details
Name: | hrzn_AssetAcquisitionNumberOfSharesIssuedForEachShareOfAcquireesCommonStock
Namespace Prefix: | hrzn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage owned after a merger or asset acquisition by the former stockholders of the acquiree. + References No definition available. + Details
Name: | hrzn_AssetAcquisitionPercentageOwnedAfterMergerByFormerStockholdersOfAcquiree
Namespace Prefix: | hrzn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage owned after a merger or asset acquisition by the legacy stockholders. + References No definition available. + Details
Name: | hrzn_AssetAcquisitionPercentageOwnedAfterMergerByLegacyStockholders
Namespace Prefix: | hrzn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of base management and incentive fees waived per quarter. + References No definition available. + Details
Name: | hrzn_BaseManagementAndIncentiveFeesAmountWaivedPerQuarter
Namespace Prefix: | hrzn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of base management and incentive fees that were waived. + References No definition available. + Details
Name: | hrzn_BaseManagementAndIncentiveFeesWaived
Namespace Prefix: | hrzn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transaction cost incurred as part of consideration transferred in asset acquisition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479908/805-50-55-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 + Details
Name: | us-gaap_AssetAcquisitionConsiderationTransferredTransactionCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
Name: | us-gaap_CashAcquiredFromAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AssetAcquisitionAxis=hrzn_MRCCMergerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |