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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:
Percentage of Consolidated Revenue
Segment20212020
Coal Mining customer43 %55 %
NAMining customer19 %19 %
Segment Reporting Information
The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
 20212020
Revenues
Coal Mining$91,851 $72,088 
NAMining69,924 42,392 
Minerals Management31,003 14,721 
Unallocated Items4,695 2,133 
Eliminations(5,627)(2,902)
Total$191,846 $128,432 
Operating profit (loss)
Coal Mining$49,059  $25,436 
NAMining109  1,872 
Minerals Management26,080  3,493 
Unallocated Items(19,553)(17,256)
Eliminations(285)(97)
Total$55,410  $13,448 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$16,830 $14,825 
NAMining21,100 13,862 
Minerals Management6,423 15,474 
Unallocated Items208 207 
Total$44,561 $44,368 
Depreciation, depletion and amortization
Coal Mining$16,649 $14,213 
NAMining4,435 2,470 
Minerals Management1,858 1,308 
Unallocated Items143 123 
Total$23,085 $18,114