Contracts - Costs, Estimated Earnings and Billings on Uncompleted Contracts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]
Costs Incurred on Uncompleted Contracts	$ 274,000	$ 1,089,000
Estimated Earnings on Uncompleted Contracts	83,000	306,000
Uncompleted Contracts	357,000	1,395,000
Less: Billings to Date	(378,000)	(1,404,000)
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts	$ 21,000	$ 9,000