Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2020

Accounts Receivable [Abstract]

Summary of accounts receivable

	2020			2019
Billed:
Construction services	$	1,282,142		$	1,321,575
Engineering services		45,423			14,594
Retainage receivable		543,416			544,911
Other receivable		9,627			6,000
Total gross receivables		1,880,608			1,887,080
Less: allowance for doubtful accounts		(785,895	)		(785,895	)
Total net receivables	$	1,094,713		$	1,101,185