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PENSION PLANS - Fair values and asset allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value	$ 15,940	$ 14,568	$ 13,009
Level 1
Fair Value	$ 15,940	$ 14,568
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Cash and Cash Equivalents [Member] \| Level 1
Fair Value	$ 928	$ 877
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	6.00%	6.00%
Cash and Cash Equivalents [Member] \| Level 1 \| Maximum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%
Cash and Cash Equivalents [Member] \| Level 1 \| Minimum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Equity Securities [Member] \| Level 1
Fair Value	$ 9,678	$ 9,755
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	61.00%	67.00%
Equity Securities [Member] \| Level 1 \| Maximum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	57.00%
Equity Securities [Member] \| Level 1 \| Minimum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Fixed income securities [Member] \| Level 1
Fair Value	$ 5,334	$ 3,936
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	33.00%	27.00%
Fixed income securities [Member] \| Level 1 \| Maximum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Fixed income securities [Member] \| Level 1 \| Minimum
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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