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Business Segments (Tables)
 3 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information
The following table presents Revenues, Cost of sales, Earnings of unconsolidated operations, Operating expenses, Operating profit (loss), Expenditures for property, plant and equipment and acquisition of mineral interests and Depreciation, depletion and amortization expense:
 THREE MONTHS ENDED
 MARCH 31
 2024 2023
Revenues
Coal Mining$15,545  $20,653 
NAMining24,483  20,633 
Minerals Management10,401 8,285 
Unallocated Items3,262 1,191 
Eliminations(402)(621)
Total$53,289  $50,141 
Cost of sales
Coal Mining$20,943 $25,878 
NAMining21,671 19,241 
Minerals Management1,364 1,052 
Unallocated Items2,712 1,214 
Eliminations(419)(601)
Total$46,271 $46,784 
Earnings of unconsolidated operations
Coal Mining$12,007 $12,466 
NAMining1,365 1,358 
Minerals Management(65)— 
Total$13,307 $13,824 
Operating expenses*
Coal Mining$7,026 $6,928 
NAMining1,822 1,920 
Minerals Management1,042 1,189 
Unallocated Items5,678 5,330 
Total$15,568 $15,367 
Operating profit (loss)
   
Coal Mining$(417) $313 
NAMining2,355  830 
Minerals Management7,930 6,044 
Unallocated Items(5,128)(5,353)
Eliminations17 (20)
Total$4,757  $1,814 

*Operating expenses consist of Selling, general and administrative expenses, Amortization of intangible assets and (Gain) loss on sale of assets.
THREE MONTHS ENDED
MARCH 31
20242023
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,794 $2,686 
NAMining5,818 4,423 
Minerals Management136 344 
Unallocated Items6,735 426 
Total$14,483  $7,879 
Depreciation, depletion and amortization
Coal Mining$2,214 $4,240 
NAMining2,256 1,886 
Minerals Management993 811 
Unallocated Items229 82 
Total$5,692 $7,019