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Note 14 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
Defined Contribution Pension [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 150		$ 150
The 401K [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 565	$ 1,156	$ 1,140	$ 1,844

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=hlly_DefinedContributionPensionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=hlly_The401kMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: