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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)	Feb. 20, 2024	Feb. 07, 2024	Jan. 18, 2024	Jan. 09, 2024
BioVaxys Technology Corp. [Member] | HIMV LLC [Member]
Proceeds from Sale of Productive Assets	$ 750,000
Disposal Group, Consideration, Stock	$ 250,000
Better Place Forests Co. [Member]
Payments to Acquire Investments				$ 800,000
Nexii Building Solutions, Inc [Member]
Payments to Acquire Investments			$ 900,000
Ceribell, Inc. [Member]
Payments to Acquire Investments		$ 14,000,000
Repayments of Debt		$ 11,300,000

X

- Definition

Amount of consideration received as stock for disposal group.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrzn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

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Period Type:	duration

X

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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Period Type:	duration

X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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