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Revenue Recognition (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Performance obligations satisfied in prior period, amount recognized | $ 2,100,000 | $ 1,800,000
Opening contract liability | 1,000,000 | $ 1,400,000
Contract assets recognized | $ 0 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 3 years |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 5 years |

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- Definition Contract With Customer, Variable Consideration From Uncertainty Of Collectability, Performance Obligation Satisfied in Previous Period + References No definition available. + Details
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Period Type: | duration

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- Definition Performance Obligation, Contract Term + References No definition available. + Details
Name: | nacco_PerformanceObligationContractTerm
Namespace Prefix: | nacco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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Balance Type: | na
Period Type: | duration

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

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- Details
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Balance Type: |
Period Type: |