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Pension and Profit Sharing - Estimated Future Benefit Payments (Details) | Dec. 31, 2017 USD ($)
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Estimated future benefit payments: |
2018 | $ 186,000
2019 | 169,000
2020 | 152,000
2021 | 137,000
2022 | 122,000
Years 2023 - 2027 | $ 439,000

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