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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table disaggregates revenue by major sources for the years ended December 31:
Major Goods/Service Lines
2019
 
2018
Coal Mining
$
68,701

 
$
81,549

NAMining
42,823

 
36,950

Minerals Management
30,119

 
17,352

Unallocated Items
790

 
665

Eliminations
(1,443
)
 
(1,141
)
Total revenues
$
140,990

 
$
135,375

 
 
 
 
Timing of Revenue Recognition
 
 
 
Goods transferred at a point in time
$
66,102

 
$
78,849

Services transferred over time
74,888

 
56,526

Total revenues
$
140,990

 
$
135,375
Contract Balances
The opening and closing balances of the Company’s current and long-term contract liabilities and receivables are as follows:
 
Contract balances
 
Trade accounts receivable, net
 
Contract liability (current)
 
Contract liability (long-term)
Balance, January 1, 2019
$
20,817

 
$
754

 
$
2,008

Balance, December 31, 2019
15,444

 
944

 
2,153

Increase (decrease)
$
(5,373
)
 
$
190

 
$
145