Construction Backlog (Tables)

3 Months Ended

Mar. 31, 2019

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Schedule of backlog of signed construction and engineering contracts

	March 31, 2019			December 31, 2018
Balance - beginning of period	$	97,657,379		$	76,659,029
New contracts and change orders during the period		(82,415	)		29,189,062
Subtotal		97,574,964			105,848,091
Less: contract revenue earned during the period		(1,735,124	)		(8,190,712	)
Balance - end of period	$	95,839,840		$	97,657,379

Construction Backlog [Member]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Schedule of expects to satisfy remaining unsatisfied performance obligation

	2019
Within 1 year	$	20,847,051
1 to 2 years		54,546,876
Thereafter		20,445,913
Total Backlog	$	95,839,840