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Business Segments (Tables)
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting Information The following tables present revenue, operating profit, depreciation expense and capital expenditures:
 THREE MONTHS ENDED
 MARCH 31
 2021 2020
Revenues
Coal Mining$23,739  $20,928 
NAMining16,142  11,624 
Minerals Management5,500 5,241 
Unallocated Items143 26 
Eliminations(419)(175)
Total$45,105  $37,644 
Operating profit (loss)   
Coal Mining$8,684  $7,185 
NAMining130  731 
Minerals Management4,235 4,267 
Unallocated Items(4,773)(4,560)
Eliminations54 (43)
Total$8,330  $7,580 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,617 $823 
NAMining2,866 4,023 
Minerals Management393 463 
Unallocated Items— 49 
Total$4,876  $5,358 
Depreciation, depletion and amortization
Coal Mining$4,207 $3,543 
NAMining899 646 
Minerals Management447 327 
Unallocated Items32 28 
Total$5,585 $4,544