Employee Benefit Plans - Schedule of amounts recognized in the balances sheets (Details) - Other Postretirement Benefit Plans - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized in the balances sheets
Current portion - retirement benefits and other	$ 87,000	$ 136,000
Long-term liabilities - retirement benefits and other	3,975,000	5,729,000
Amounts recognized in the balances sheets	4,062,000	5,865,000
Accumulated other comprehensive loss, before income taxes:
Net actuarial loss	$ 2,958,000	$ 4,947,000

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

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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