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Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 61,656 $ 46,546 $ 167,290 $ 158,037
Cost of sales 54,412 48,720 146,010 150,447
Earnings of unconsolidated operations 15,155 12,754 42,054 37,662
Operating expenses (income) 16,312 16,847 45,124 47,955
Operating profit (loss) 19,699 (6,267) 31,822 (2,703)
Expenditures for property, plant and equipment and acquisition of mineral interests 8,296 23,759 30,697 37,894
Depreciation, depletion and amortization 6,251 7,320 18,950 21,429
Operating segments | Coal Mining        
Segment Reporting Information [Line Items]        
Revenues 17,706 18,665 48,247 65,661
Cost of sales 18,054 26,819 55,135 85,966
Earnings of unconsolidated operations 13,821 11,259 37,834 33,687
Operating expenses (income) 7,147 7,802 22,270 22,441
Operating profit (loss) 19,938 (4,697) 22,288 (9,059)
Expenditures for property, plant and equipment and acquisition of mineral interests 3,338 1,469 7,045 5,187
Depreciation, depletion and amortization 2,154 4,336 7,264 12,924
Operating segments | NAMining        
Segment Reporting Information [Line Items]        
Revenues 32,326 21,722 84,729 64,071
Cost of sales 31,379 20,286 77,304 58,411
Earnings of unconsolidated operations 1,122 1,495 3,935 3,975
Operating expenses (income) 2,543 2,065 6,394 5,725
Operating profit (loss) (474) 866 4,966 3,910
Expenditures for property, plant and equipment and acquisition of mineral interests 3,170 21,450 14,156 30,380
Depreciation, depletion and amortization 2,672 2,058 7,362 5,799
Operating segments | Minerals Management        
Segment Reporting Information [Line Items]        
Revenues 8,849 5,747 24,843 23,203
Cost of sales 1,286 1,064 4,151 3,026
Earnings of unconsolidated operations 213 0 286 0
Operating expenses (income) 1,588 1,073 (731) 3,234
Operating profit (loss) 6,188 3,610 21,709 16,943
Expenditures for property, plant and equipment and acquisition of mineral interests 708 776 854 1,758
Depreciation, depletion and amortization 1,092 768 3,408 2,328
Unallocated Items        
Segment Reporting Information [Line Items]        
Revenues 3,745 966 11,573 6,785
Cost of sales 4,622 1,086 11,501 4,675
Earnings of unconsolidated operations (1) 0 (1) 0
Operating expenses (income) 5,034 5,907 17,191 16,555
Operating profit (loss) (5,912) (6,027) (17,120) (14,445)
Expenditures for property, plant and equipment and acquisition of mineral interests 1,080 64 8,642 569
Depreciation, depletion and amortization 333 158 916 378
Eliminations        
Segment Reporting Information [Line Items]        
Revenues (970) (554) (2,102) (1,683)
Cost of sales (929) (535) (2,081) (1,631)
Operating profit (loss) $ (41) $ (19) $ (21) $ (52)