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Note D - Leases (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | $ 700 |  | $ 700 | $ 800
Operating Lease, Right-of-Use Asset | 18,300 |  | 18,300 | 21,400
Finance Lease, Right-of-Use Asset, Accumulated Depreciation |  | $ 800 |  | $ 700
Asset Impairment Charges, Total | 0 |  | 0 |
Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year | 600 |  | 600 |
Lessor, Operating Lease, Payment to be Received, Year One | $ 200 |  | $ 200 |
Minimum [Member] |  |  |  |
Lessee, Lease Remaining Lease Term (Year) |  |  | 1 year |
Maximum [Member] |  |  |  |
Lessee, Lease Remaining Lease Term (Year) |  |  | 9 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
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Namespace Prefix: | hrth_
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Balance Type: | credit
Period Type: | instant

X
- Definition The remaining lease term for leases of the lessee. + References No definition available. + Details
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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
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Balance Type: | na
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X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228 + Details
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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 https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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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 https://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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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 https://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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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 https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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X
- Details
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- Details
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Period Type: |