Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Accounts Receivable [Abstract]

Summary of accounts receivable

	2016			2015
Billed:
SG Block sales	$	160,237		$	82,200
Engineering services		14,180			14,181
Project management		8,796			14,400
Total gross receivables		183,213			110,781
Less: allowance for doubtful accounts		(24,746	)		(24,746	)
Total net receivables	$	158,467		$	86,035