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Pension Plans (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Pension Plans, Defined Benefit
Pension plans
Fair values of pension assets	$ 1,406,000	$ 1,322,000

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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