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Costs and Estimated Earnings on Uncompleted Contracts (Tables)

3 Months Ended

Mar. 31, 2018

Costs and Estimated Earnings on Uncompleted Contracts [Abstract]

Summary of costs and estimated earnings on uncompleted contracts

		March 31, 2018				December 31, 2017
Costs incurred on uncompleted contracts		$	5,026,529			$	3,681,965
Estimated earnings to date on uncompleted contracts			472,891				328,273
Subtotal			5,499,420				4,010,238
Less: billings to date			(6,661,210	)			(5,622,111	)
Net contract liabilities		$	(1,161,790	)		$	(1,611,873	)

Summary of costs included in condensed consolidated balance sheets

		March 31, 2018				December 31, 2017
Costs and estimated earnings in excess of billings on uncompleted contracts		$	1,412			$	61,175
Billings in excess of cost and estimated earnings on uncompleted contracts			(1,163,202	)			(1,673,048	)
Net contract liabilities		$	(1,161,790	)			(1,611,873	)