Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2012

Accounts Receivable [Abstract]

Summary of accounts receivable

	2012		2011
Billed:
SG Block sales	$	179,826	$	137,560
Engineering services		168,682		33,317
Project management		68,061		19,578
Unbilled:
Engineering services		21,674		-
Project management		-		2,880
Total gross receivables		438,243		193,335
Less: allowance for doubtful accounts		(103,126)		(50,015)
Total net receivables	$	335,117	$	143,320