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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2020
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
Segment20202019
Coal Mining customer55 %48 %
NAMining customer19 %21 %
Minerals Management lessee
less than 10%
12 %
Segment Reporting Information
The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
 20202019
Revenues
Coal Mining$72,088 $68,701 
NAMining42,392 42,823 
Minerals Management14,721 30,119 
Unallocated Items2,133 790 
Eliminations(2,902)(1,443)
Total$128,432 $140,990 
Operating profit (loss)
Coal Mining$25,436  $34,120 
NAMining1,872  (564)
Minerals Management3,493  25,721 
Unallocated Items(17,256)(20,713)
Eliminations(97)256 
Total$13,448  $38,820 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$14,825 $15,092 
NAMining13,862 8,824 
Minerals Management15,474 517 
Unallocated Items207 231 
Total$44,368 $24,664 
Depreciation, depletion and amortization
Coal Mining$14,213 $12,409 
NAMining2,470 2,223 
Minerals Management1,308 1,362 
Unallocated Items123 246 
Total$18,114 $16,240