XML 56 R39.htm IDEA: XBRL DOCUMENT v3.22.4

Note 4 - Investments - Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investments at cost	$ 721,248	$ 453,837
Investments at fair value	720,026	458,075
Biotechnology Sector [Member]
Investments at cost	193,372	109,899
Investments at fair value	195,006	107,902
Medical Device Sector [Member]
Investments at cost	132,803	88,681
Investments at fair value	135,960	84,567
Communications Sector [Member]
Investments at cost	22,892	22,853
Investments at fair value	26,176	25,920
Consumer-related Sector [Member]
Investments at cost	121,961	92,158
Investments at fair value	114,050	93,194
Data Storage Sector [Member]
Investments at cost	476	476
Investments at fair value	1,316	1,047
Internet and Media Sector [Member]
Investments at cost	329	569
Investments at fair value	1,159	3,305
Networking Sector [Member]
Investments at cost	11,831	17,390
Investments at fair value	11,710	17,964
Power Management Sector [Member]
Investments at cost	1,585	1,585
Investments at fair value	2,610	2,609
Semiconductor Sector [Member]
Investments at cost	56	101
Investments at fair value	0	0
Software Sector [Member]
Investments at cost	120,157	60,902
Investments at fair value	118,716	60,807
Energy Efficiency [Member]
Investments at cost	8	0
Investments at fair value	27	0
Other Sustainability Sector [Member]
Investments at cost	84,633	46,595
Investments at fair value	85,524	47,011
Diagnostics Sector [Member]
Investments at cost	9,851	12,393
Investments at fair value	9,858	12,377
Other Sector [Member]
Investments at cost	7,559	175
Investments at fair value	3,870	1,177
Software, Healthcare Information and Service [Member]
Investments at cost	13,735	60
Investments at fair value	14,044	195
Debt [Member]
Investments at cost	701,074	441,885
Investments at fair value	686,458	437,317
Warrant [Member]
Investments at cost	14,790	10,023
Investments at fair value	29,712	20,200
Other Debt Obligations [Member]
Investments at cost	1,200	1,450
Investments at fair value	1,300	200
Equity Securities [Member]
Investments at cost	4,184	479
Investments at fair value	$ 2,556	$ 358

X

- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

+ Details

Name:	us-gaap_InvestmentOwnedAtCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

+ Details

Name:	us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_BiotechnologySectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_MedicalDeviceSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_CommunicationsSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_ConsumerrelatedSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_DataStorageSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_InternetAndMediaSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_NetworkingSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_PowerManagementSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_SemiconductorSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_SoftwareSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_EnergyEfficiencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_OtherSustainabilitySectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_DiagnosticsSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_OtherSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=hrzn_SoftwareHealthcareInformationAndServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: