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Note 8 - Federal Income Tax - Tax Characters of Distributions Paid (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Ordinary income | $ 42,576 | $ 31,490 | $ 25,099
Total | $ 42,576 | $ 31,490 | $ 25,099

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