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Business Segments (Statements of Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Revenues from external customers $ 135,375 $ 104,778
Gross profit (loss) 29,968 16,919
Earnings of unconsolidated operations 64,994 61,361
Selling, general and administrative expenses, including Amortization of intangible assets 52,230 49,614
Operating profit (loss) 43,624 32,814
Operating Segments | NACoal    
Segment Reporting Information [Line Items]    
Revenues from external customers 135,375 104,778
Gross profit (loss) 30,337 17,198
Selling, general and administrative expenses, including Amortization of intangible assets 45,939 42,516
Operating profit (loss) 50,284 39,677
NACCO and Other | NACCO and Other    
Segment Reporting Information [Line Items]    
Gross profit (loss) (369) (279)
Selling, general and administrative expenses, including Amortization of intangible assets 6,291 7,098
Operating profit (loss) $ (6,660) $ (6,863)