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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
Segment Reporting Information
The following tables present revenue, operating profit, depreciation expense and capital expenditures:
 
THREE MONTHS ENDED
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2019
 
2018
 
2019
 
2018
Revenues
 
 
 
 
 
 
 
Coal Mining
$
18,799

 
$
18,583

 
$
58,119

 
$
57,040

NAMining
8,993

 
9,092

 
30,496

 
28,372

Minerals Management
5,022

 
3,902

 
25,950

 
11,244

Unallocated Items
52

 
—

 
726

 
—

Eliminations
(263
)
 
(137
)
 
(1,239
)
 
(335
)
Total
$
32,603

 
$
31,440

 
$
114,052

 
$
96,321

 
 
 
 
 
 
 
 
Operating profit (loss)
 

 
 

 
 
 
 
Coal Mining
$
7,341

 
$
9,814

 
$
19,639

 
$
26,409

NAMining
(391
)
 
281

 
(842
)
 
1,072

Minerals Management
3,900

 
2,770

 
22,358

 
8,926

Unallocated Items
(2,286
)
 
(2,318
)
 
(7,115
)
 
(8,337
)
Eliminations
99

 
—

 
157

 
—

Total
$
8,663

 
$
10,547

 
$
34,197

 
$
28,070


Expenditures for property, plant and equipment
 
 
 
 
 
 
 
Coal Mining
$
2,291

 
$
2,162

 
$
6,542

 
$
6,588

NAMining
4,971

 
3,122

 
6,213

 
6,353

Minerals Management
—

 
—

 
291

 
1,182

Unallocated Items
35

 
166

 
218

 
509

Total
$
7,297

 
$
5,450

 
$
13,264

 
$
14,632

 
 
 
 
 
 
 
 
Depreciation, depletion and amortization
 
 
 
 
 
 
 
Coal Mining
$
3,102

 
$
3,097

 
$
9,252

 
$
9,030

NAMining
588

 
441

 
1,699

 
1,263

Minerals Management
324

 
250

 
1,057

 
562

Unallocated Items
30

 
27

 
87

 
80

Total
$
4,044

 
$
3,815

 
$
12,095

 
$
10,935