Annual report pursuant to Section 13 and 15(d)

Uncompleted Contracts - Costs, Estimated Earnings, and Related Billings (Details)

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Uncompleted Contracts - Costs, Estimated Earnings, and Related Billings (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Uncompleted Contracts [Abstract]    
Cost incurred to date $ 867,232,427 $ 1,647,328,123
Estimated earnings 119,723,818 343,455,309
Total Costs Incurred to Date and Estimated Earnings 986,956,245 1,990,783,432
Less - billings to date (947,131,616) (1,948,515,268)
Net $ 39,824,629 $ 42,268,164