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Note 8 - Federal Income Tax - Tax Characters of Distributions Paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Ordinary income	$ 49,467	$ 42,576	$ 31,490
Total	$ 49,467	$ 42,576	$ 31,490

X

- Definition

Amount of dividend distribution from ordinary income and capital gain paid during the period. Excludes distribution for tax return of capital.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total distribution.

+ References

No definition available.

+ Details

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