Significant Accounting Policies (Stock-based Compensation and Other) (Details) - Class A Common Stock - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Executives \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	165,574	138,306
Class A common stock available for issuance under the plan (shares)	396,120
Compensation expense related to share awards	$ 6,400,000	$ 4,100,000
Compensation expense related to share awards, net of tax	$ 5,000,000	3,200,000
Non-employee directors \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class A common stock available for issuance under the plan (shares)	136,047
Compensation expense related to share awards	$ 1,300,000	1,300,000
Compensation expense related to share awards, net of tax	$ 1,000,000	$ 1,100,000
Non-employee directors \| Restricted stock
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	30,034	45,223
Amount of directors, annual retainer paid in restricted shares	$ 110,000	$ 105,000
Annual non-employee directors retainer amount	$ 175,000	$ 167,000
Non-employee directors \| Voluntary shares
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	480	753
Percentage of annual retainer that may be received in shares of Class A stock (percent)	100.00%
Chairman \| Restricted stock
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of directors, annual retainer paid in restricted shares	$ 150,000	$ 150,000
Annual non-employee directors retainer amount	$ 250,000	$ 250,000
Participant's retirement date \| Executives \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	3 years
Award date \| Executives \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	5 years
Award date \| Non-employee directors \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	10 years
Participants retirement from board of directors \| Non-employee directors \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	5 years
Minimum age of director upon retirement from board \| Non-employee directors \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	70 years
Minimum \| Award date \| Executives \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	3 years
Maximum \| Award date \| Executives \| Share-based Payment Arrangement
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	10 years

Non-employee Directors Annual Retainer, Amount Paid In Restricted Shares

No definition available.

Name:	nacco_NonEmployeeDirectorsAnnualRetainerAmountPaidInRestrictedShares
Namespace Prefix:	nacco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Non-employee Directors Annual Retainer

+ References

No definition available.

+ Details

Name:	nacco_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonEmployeeDirectorsAnnualRetainer
Namespace Prefix:	nacco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Restriction Period

+ References

No definition available.

+ Details

Name:	nacco_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictionPeriod
Namespace Prefix:	nacco_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation By Share-based Payment Award, Annual Retainer Convertible To Class A Common Stock, Percentage

+ References

No definition available.

+ Details

Name:	nacco_ShareBasedCompensationByShareBasedPaymentAwardAnnualRetainerConvertibleToClassACommonStockPercentage
Namespace Prefix:	nacco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=nacco_VoluntarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_BoardOfDirectorsChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nacco_SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictionCategoryAxis=nacco_ParticipantsRetirementDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nacco_SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictionCategoryAxis=nacco_AwardDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nacco_SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictionCategoryAxis=nacco_ParticipantsRetirementFromBoardOfDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nacco_SharebasedCompensationArrangementBySharebasedPaymentAwardRestrictionCategoryAxis=nacco_MinimumAgeOfDirectorUponRetirementFromBoardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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