XML 91 R76.htm IDEA: XBRL DOCUMENT v3.21.1

Note I - Income Taxes - Reconciliation of Deferred Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 38,379	$ 31,170
Deferred Income Tax Expense	(7,534)	6,086
Return to Provision Impact	12	(364)
Other Comprehensive Income	(16)	1,487
Balance	$ 30,841	$ 38,379

X

- Definition

Represents valuation allowance of deferred tax assets for deferred income tax expense (benefit).

+ References

No definition available.

+ Details

Name:	hrth_ValuationAllowanceDeferredTaxAssetDeferredIncomeTaxExpenseBenefit
Namespace Prefix:	hrth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents other comprehensive income for deferred tax asset valuation.

+ References

No definition available.

+ Details

Name:	hrth_ValuationAllowanceDeferredTaxAssetOtherComprehensiveIncome
Namespace Prefix:	hrth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of valuation allowance for deferred tax asset return to provision impact.

+ References

No definition available.

+ Details

Name:	hrth_ValuationAllowanceDeferredTaxAssetReturnToProvisionImpact
Namespace Prefix:	hrth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant