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Costs incurred and estimated earnings net of billings on uncompleted contracts (Tables)
 12 Months Ended
Dec. 31, 2015
Contractors [Abstract]  
Schedule of costs in excess of billings on uncompleted contracts
 
 
December 31, 2015

 
December 31, 2014

Costs incurred and estimated earnings on uncompleted contracts
 
$
275,316

 
$
629,416

Less billings to date
 
(258,208
)
 
(585,794
)
 
 
$
17,108

 
$
43,622


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2015

 
December 31, 2014

Unbilled revenue
 
$
17,565

 
$
43,622

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(457
)
 
—

 
 
$
17,108

 
$
43,622