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Note 16 - Lease Commitments (Details Textual) - USD ($) $ in Thousands | Jul. 02, 2023 | Jan. 01, 2022
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Increase in Noncurrent Assets for Right-of-Use Assets |  | $ 33,887
Increase in Liabilities for Associated Lease Obligations |  | $ 34,579
Minimum [Member] |  |
Lessee, Operating Lease, Remaining Lease Term (Year) | 1 year |
Maximum [Member] |  |
Lessee, Operating Lease, Remaining Lease Term (Year) | 11 years |

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- Definition Represents the increase in liabilities for associated lease obligations. + References No definition available. + Details
Name: | hlly_IncreaseInLiabilitiesForAssociatedLeaseObligations
Namespace Prefix: | hlly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the increase in noncurrent assets for right-of-use assets. + References No definition available. + Details
Name: | hlly_IncreaseInNoncurrentAssetsForRightofuseAssets
Namespace Prefix: | hlly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |