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Note H - Components of Net Periodic Benefit Cost (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Qualified Pension Plan [Member]
Defined Benefit Plan, Minimum Employer Contributions, Fiscal Year	$ 0.4
Defined Benefit Plan, Plan Assets, Contributions by Employer	0.3
Restoration Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 0.9	$ 0.9

X

- Definition

The minimum amount of contribution to be received by defined benefit plan from employer in the fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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-Publisher FASB
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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: