v3.25.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 1-9172  
Entity Registrant Name NACCO INDUSTRIES, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 34-1505819  
Entity Address, Address Line One 22901 Millcreek Blvd.  
Entity Address, Address Line Two Suite 600  
Entity Address, City or Town Cleveland,  
Entity Address, State or Province OH  
Entity Address, Postal Zip Code 44122  
City Area Code (440)  
Local Phone Number 229-5151  
Title of 12(b) Security Class A Common Stock, $1 par value per share  
Trading Symbol NC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Central Index Key 0000789933  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Shares Outstanding Class A    
Entity Information [Line Items]    
Shares Outstanding (in shares)   5,888,500
Shares Outstanding Class B    
Entity Information [Line Items]    
Shares Outstanding (in shares)   1,563,153