Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2019

Accounts Receivable [Abstract]

Summary of accounts receivable

	2019		2018
Billed:
Block sales	$	—	$	14,723
Construction services		1,321,575		1,619,498
Engineering services		14,594		400,877
Retainage receivable		544,911		543,417
Other receivable		6,000		7,706
Total gross receivables		1,887,080		2,586,221
Less: allowance for doubtful accounts		(785,895)		(839,895	)
Total net receivables	$	1,101,185	$	1,746,326