COSTS AND ESTIMATED PROFITS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Schedule of costs and estimated earnings on uncompleted contracts [Abstract]
Costs incurred on uncompleted contracts	$ 50,861	$ 36,969
Estimated profits, thereon	16,693	6,711
Total	67,554	43,680
Less: billings to date	50,732	29,315
Net	16,822	14,365
Schedule of Costs and Estimated Earnings on Uncompleted Contracts Included in Condensed Consolidated Balance Sheets [Abstract]
Costs and estimated profits in excess of billings	17,714	18,459
Billings in excess of costs and estimated profits	(891)	(4,061)
Translation adjustment	(1)	(33)
Net	16,822	$ 14,365
Balances previously classified as contract liabilities at the beginning of the period that have shipped	$ 3,900