CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income	$ 3,839	$ 3,512	$ 10,754	$ 2,545
Other comprehensive income (loss)
Derivative qualifying as a cash flow hedge, net of taxes (nil)	65	57	326	(786)
Employee pension plan adjustments, net of taxes (nil)	(134)	140	(403)	420
Comprehensive income	$ 3,770	$ 3,709	$ 10,677	$ 2,179