XML 178 R95.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Supplemental Oil and Gas Disclosures (Unaudited) (Oil and Natural Gas Costs) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Extractive Industries [Abstract] |  |
Proved developed | $ 16,720 | $ 16,179
Proved undeveloped | 52,428 | 51,971
Proved reserves | 69,148 | 68,150
Less: accumulated depreciation, depletion and amortization | 6,061 | 3,309
Net royalty interests in oil and natural gas properties | $ 63,087 | $ 64,841

X
- Definition Proved Developed Oil and Gas Property, Successful Effort Method + References No definition available. + Details
Name: | nacco_ProvedDevelopedOilAndGasPropertySuccessfulEffortMethod
Namespace Prefix: | nacco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proved Undeveloped Oil and Gas Property, Successful Effort Method + References No definition available. + Details
Name: | nacco_ProvedUndevelopedOilAndGasPropertySuccessfulEffortMethod
Namespace Prefix: | nacco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | srt_ExtractiveIndustriesAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated depreciation, depletion, amortization and impairment of oil and gas property carried under the successful effort method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant