Deferred income taxes that are recognized as increases (decreases) in other comprehensive income as they arise.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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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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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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PENSION PLAN (Details) - USD ($) $ in Thousands	12 Months Ended
PENSION PLAN (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in the consolidated balance sheets [Abstract]
Noncurrent liabilities	$ (4,252)	$ (4,015)
Amounts recognized in accumulated other comprehensive loss [Abstract]
Accumulated loss	(5,655)	(5,648)
Deferred income taxes	2,367	2,366
Accumulated other comprehensive loss	(3,288)	(3,282)
Accumulated benefit obligation	24,400	22,800
COMPONENTS OF NET PERIODIC BENEFIT COST [Abstract]
Service cost	35	33
Interest cost	654	812
Expected return on plan assets	(1,044)	(1,011)
Recognized net actuarial loss	585	691
Net periodic benefit cost	230	525
Amortization of estimated net loss, transition obligation and prior service cost from accumulated other comprehensive income into net periodic benefit cost	500
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 20,106	$ 18,817	$ 16,835
Fair value of total plan assets by major asset category	100.00%	100.00%
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate	2.08%	2.93%
Rate of compensation increase	2.75%	2.75%
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Discount rate	2.08%	2.93%
Pension contributions	$ 0	$ 0
Expected benefit payments for the plan [Abstract]
Maximum contribution by employee specified as percentage of compensation	25.00%
Additional contribution by employer	30.00%
Maximum percentage of compensation contributed by employer as matching contribution	6.00%
Compensation expense for the 401(k) plan	$ 400	100
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	20,106	18,817
Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Equity Securities [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 6,688	$ 6,259
Fair value of total plan assets by major asset category	33.00%	33.00%
Equity Securities [Member] \| Minimum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	30.00%
Equity Securities [Member] \| Maximum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	70.00%
Equity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 6,688	$ 6,259
Equity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Fixed Income [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 6,739	$ 6,313
Fair value of total plan assets by major asset category	34.00%	34.00%
Fixed Income [Member] \| Minimum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	20.00%
Fixed Income [Member] \| Maximum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	60.00%
Fixed Income [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 6,739	$ 6,313
Fixed Income [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Fixed Income [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
International Equities [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 4,480	$ 4,165
Fair value of total plan assets by major asset category	22.00%	22.00%
International Equities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 4,480	$ 4,165
International Equities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
International Equities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Real Estate [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 1,016	$ 964
Fair value of total plan assets by major asset category	5.00%	5.00%
Real Estate [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 1,016	$ 964
Real Estate [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Real Estate [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Cash and Equivalents [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 1,183	$ 1,116
Fair value of total plan assets by major asset category	6.00%	6.00%
Cash and Equivalents [Member] \| Minimum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	0.00%
Cash and Equivalents [Member] \| Maximum [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Target plan asset allocations	10.00%
Cash and Equivalents [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 1,183	$ 1,116
Cash and Equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	0	0
Cash and Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Plan assets using the fair value hierarchy [Abstract]
Fair value of plan assets	$ 0	$ 0
Pension Plan [Member]
Weighted-average assumptions used to determine net periodic pension cost [Abstract]
Discount rate	2.08%	2.93%
Rate of compensation increase	2.75%	2.75%
Long-term rate of return	5.25%	5.75%
Expected benefit payments for the plan [Abstract]
2021	$ 1,336
2022	1,356
2023	1,385
2024	1,401
2025	1,388
Years 2026-2030	$ 6,743