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Costs incurred and estimated earnings net of billings on uncompleted contracts (Tables)
 12 Months Ended
Mar. 31, 2013
Contractors [Abstract]  
Schedule of costs in excess of billings on uncompleted contracts
 
 
March 31, 2013

 
March 31, 2012

Costs incurred and estimated earnings on uncompleted contracts
 
$
512,339

 
$
587,220

Less billings to date
 
(463,241
)
 
(509,511
)
 
 
$
49,098

 
$
77,709


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
March 31, 2013

 
March 31, 2012

Unbilled revenue
 
$
56,183

 
$
86,859

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(7,085
)
 
(7,514
)
 
 
$
49,098

 
$
79,345