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Note 4 - Investments (Details Textual) - USD ($) $ in Thousands		4 Months Ended	24 Months Ended	21840 Months Ended
	Apr. 21, 2020	Apr. 21, 2020	Jun. 04, 2020	Feb. 25, 2022	Jun. 19, 2019	Jun. 01, 2018
NYL Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000	$ 100,000		$ 200,000		$ 100,000
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature	$ 200,000	$ 200,000				$ 200,000
Line of Credit Facility, Advance Rate	67.00%	67.00%			67.00%
NYL Facility [Member] | USD Mid-market Wwap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				3.00%
NYL Facility [Member] | USD Mid-market Wwap Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	3.55%		2.75%
NYL Facility [Member] | USD Mid-market Wwap Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	5.15%		3.25%
HSLFI [Member]
Payments to Acquire Investments, Total	$ 17,100
Consideration Transferred, Percentage of Warrants Held by Investment	50.00%
Dividend Income, Operating, Total		$ 0

X

- Definition

The percentage of warrants held by investment issued as consideration.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrzn_
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Balance Type:	na
Period Type:	duration

X

- Definition

The advance rate under line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrzn_
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X

- Definition

The accordion feature for the maximum borrowing capacity under line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrzn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of operating dividend income on securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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