SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Interest paid	$ 132	$ 101
Federal, state, and local income taxes paid, net	479	5,360
Change in contract receivables, net	4,746	(2,036)
Change in contract liabilities, net	(4,746)	1,936
Property, plant, and equipment purchases in accounts payable	$ 1,530	$ 470