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Uncompleted Construction Contracts (Tables)
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Schedule of Uncompleted Contracts
The status of uncompleted construction contracts is summarized below (in thousands):
 
December 31,
 
2017
 
2016
Costs incurred on uncompleted contracts
 
$
5,528

 
$
6,575

Inventory purchased for specific contracts
 
403

 
837

Estimated profit
 
612

 
1,150

Subtotal
 
6,543

 
8,562

Less billings to date
 
(6,961
)
 
(8,169
)
Total
 
$
(418
)
 
$
393

Included in the following balance sheet captions:
 
 

 
 

Costs and estimated profit in excess of billings
 
$
565

 
$
1,045

Billings in excess of costs and estimated profit
 
(983
)
 
(652
)
Total
 
$
(418
)
 
$
393