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Note D - Leases (Details Textual) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Lessee, Lease, Termination Period (Year) | 1 year |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | $ 810 | $ 957
Operating Lease, Right-of-Use Asset | 19,569 | 23,793
Finance Lease, Right-of-Use Asset, Accumulated Depreciation | 700 | $ 500
Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year | 200 |
Lessor, Operating Lease, Payment to be Received, Year One | 600 |
Lessor, Operating Lease, Payment to be Received, Year Two | $ 200 |
Minimum [Member] |  |
Lessee, Lease Remaining Lease Term (Year) | 1 year |
Maximum [Member] |  |
Lessee, Lease Remaining Lease Term (Year) | 6 years |
Lessee, Lease, Renewal Term (Year) | 5 years |

X
- Definition The amount of accumulated depreciation for right-of-use asset under finance lease. + References No definition available. + Details
Name: | hrth_FinanceLeaseRightofUseAssetAccumulatedDepreciation
Namespace Prefix: | hrth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The remaining lease term for leases of the lessee. + References No definition available. + Details
Name: | hrth_LesseeLeaseRemainingLeaseTerm
Namespace Prefix: | hrth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The renewal term for leases of the lessee. + References No definition available. + Details
Name: | hrth_LesseeLeaseRenewalTerm
Namespace Prefix: | hrth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The termination period for leases of the lessee. + References No definition available. + Details
Name: | hrth_LesseeLeaseTerminationPeriod
Namespace Prefix: | hrth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lease payment to be received by lessor for operating lease in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |