XML 248 R91.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Supplemental Oil and Gas Disclosures (Unaudited) (Oil and Natural Gas Costs) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Extractive Industries [Abstract] |  |
Proved developed | $ 16,179 | $ 7,302
Proved undeveloped | 51,971 | 24,134
Proved reserves | 68,150 | 31,436
Less: accumulated depreciation, depletion and amortization | 3,309 | 1,936
Net royalty interests in oil and natural gas properties | $ 64,841 | $ 29,500

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://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(b)) -SubTopic 10 -Topic 932 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479664/932-10-S99-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAmortizationAndImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Oil and Gas properties, gross, carried under the successful effort method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479664/932-10-S99-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479664/932-10-S99-1 + Details
Name: | us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant