Uncompleted Contracts (Tables)

6 Months Ended

Jun. 30, 2020

Costs, estimated earnings and billings on uncompleted contracts are as follows:

	June 30,			December 31,
	2020			2019

Revenue recognized	$	1,475,300		$	1,074,800
Less: billings to date		(1,088,300	)		(832,300	)
Costs and estimated earnings in excess of billings on uncompleted contracts		387,000			242,500

Billings to date		415,200			2,707,200
Revenue recognized		(90,100	)		(2,380,100	)

Revenue contract liabilities	$	325,100		$	327,100