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Contracts in Progress (Tables)
 3 Months Ended
Mar. 31, 2013
Contractors [Abstract]  
Contracts in progress
Contracts in progress are as follows at March 31, 2013 and December 31, 2012:
 
March 31,
2013
 
December 31,
2012
Costs incurred on uncompleted contracts
$
354,508

 
$
750,218

Estimated earnings
70,731

 
171,475

 
425,239

 
921,693

Less: Billings to date
(422,060
)
 
(918,817
)
 
$
3,179

 
$
2,876

Included in the accompanying consolidated balance sheet under the following captions:
 

 
 

Costs and estimated earnings in excess of billings on uncompleted contracts
20,363

 
$
19,245

Billings in excess of costs and estimated earnings on uncompleted contracts
(17,184
)
 
(16,369
)
 
$
3,179

 
$
2,876