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Pension and Profit Sharing - Pension Plan Assets by Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension plan assets | $ 1,028,649 | $ 1,013,831 | $ 1,249,825
Level 1 |  |  |
Pension plan assets | 184,731 | 182,831 |
Level 2 |  |  |
Pension plan assets | 843,918 | 831,000 |
Money Market Fund |  |  |
Pension plan assets | 16,794 | 17,324 |
Money Market Fund | Level 1 |  |  |
Pension plan assets | 31 | 4 |
Money Market Fund | Level 2 |  |  |
Pension plan assets | 16,763 | 17,320 |
Equity Common and Collected Funds |  |  |
Pension plan assets | 682,869 | 663,957 |
Equity Common and Collected Funds | Level 1 |  |  |
Pension plan assets | 102,030 | 99,616 |
Equity Common and Collected Funds | Level 2 |  |  |
Pension plan assets | 580,839 | 564,371 |
Fixed Income Common and Collected Funds |  |  |
Pension plan assets | 328,986 | 332,520 |
Fixed Income Common and Collected Funds | Level 1 |  |  |
Pension plan assets | 82,670 | 83,211 |
Fixed Income Common and Collected Funds | Level 2 |  |  |
Pension plan assets | $ 246,316 | $ 249,309 |

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