Uncompleted Construction Contracts - Schedule of Billings in Excess of Costs and Estimated Profit (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 23,697	$ 21,282
Inventory purchased for specific contracts	1,989	445
Estimated profit	1,741	2,717
Sub-total	27,427	24,444
Less billings to date	(27,003)	(22,941)
Total	424	1,503
Costs and estimated profit in excess of billings	1,098	1,791
Billings in excess of costs and estimated profit	(674)	(288)
Total	$ 424	$ 1,503