Nature of Operations and Basis of Presentation (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Long-term Purchase Commitment [Line Items]
Number of operating segments | segment			3
Long-term contracts percentage	100.00%		100.00%
Business interruption insurance recoveries	$ 0	$ 13,612	$ 0	$ 13,612
Prepaid profit sharing	9,580		9,580			$ 0
Gain (loss) from liability settlement	0	0	3,590	0
Excess funding liability	5,450		5,450			0
Assets held for sale	15,359		15,359			14,159
Pension Plan
Long-term Purchase Commitment [Line Items]
Prepaid profit sharing	9,600		9,600
Payments for liability settlement			10,900
Gain (loss) from liability settlement			3,600
Liability settlement, amount awarded to other party			5,500
Excess funding liability	5,400		5,400
Pension Plan | NACCO 401(K) Plan
Long-term Purchase Commitment [Line Items]
Prepaid profit sharing					$ 14,500
Minerals and Royalties
Long-term Purchase Commitment [Line Items]
Proceeds from sale, land, held-for-use				7,000
Gain (loss) on sale of properties				4,500
Eiger, LLC
Long-term Purchase Commitment [Line Items]
Investments in unconsolidated subsidiaries	19,066		19,066			19,147
Eiger, LLC | Minerals and Royalties
Long-term Purchase Commitment [Line Items]
Investments in unconsolidated subsidiaries	19,100		19,100			$ 19,100
Income from equity method investments	$ 1,100	$ 200	$ 1,900	$ 400