Consolidated Financial Statements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognized under the percentage of completion method	6.70%		3.80%
Costs in excess of billings	$ 14,041,000		$ 14,041,000
Billings in excess of costs	21,133,000		21,133,000
Sale price			$ 26,373,000
Period of lease			5 years
Net present value of future minimum lease payments	5,765,000		$ 5,765,000
Deferred gain on sale	13,144,000		13,144,000
Recognized gain exceeding fair value		$ 7,379,000	6,799,000
Minimum lease payment, year one	1,378,000		1,378,000
Minimum lease payment, year two	1,378,000		1,378,000
Minimum lease payment, year three	1,378,000		1,378,000
Minimum lease payment, year four	1,378,000		1,378,000
Minimum lease payment, year five	$ 1,378,000		$ 1,378,000