COSTS AND ESTIMATED PROFITS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of costs and estimated earnings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 47,906	$ 37,899
Estimated profits, thereon	5,439	2,665
Total	53,345	40,564
Less: billings to date	21,962	17,881
Net	31,383	22,683
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	35,534	26,915
Billings in excess of costs and estimated profits on uncompleted contracts	(4,156)	(4,249)
Translation adjustment	5	17
Net	$ 31,383	$ 22,683