Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2017

Accounts Receivable [Abstract]

Summary of accounts receivable

	2017			2016
Billed:
SG Block sales	$	57,997		$	124,713
Engineering services		84,281			144,040
Project management		-			-
Total gross receivables		142,278			268,753
Less: allowance for doubtful accounts		(34,235	)		(34,235	)
Total net receivables	$	108,043		$	234,518