COSTS AND ESTIMATED PROFITS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of costs and estimated earnings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 37,899	$ 25,214
Estimated earnings, thereon	2,665	6,274
Total	40,564	31,488
Less: billings to date	17,881	15,864
Net	22,683	15,624
Schedule of Costs and Estimated Earnings on Uncompleted Contracts Included in Condensed Consolidated Balance Sheets [Abstract]
Costs and estimated profits in excess of billings on uncompleted contracts	26,915	18,421
Billings in excess of costs and estimated profits on uncompleted contracts	(4,249)	(2,813)
Translation adjustment	17	16
Net	$ 22,683	$ 15,624