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Pension and Profit Sharing - Amounts Recognized in Other Comprehensive Income (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |  |
Balance at beginning of the year | $ 1,130,815 | $ 1,426,030 |  |
Change in net loss | (106,725) | (169,818) |  |
Amortization of actuarial loss | (108,052) | (124,854) |  |
Amortization of prior service cost | (543) | (543) |  |
Change recognized in other comprehensive income | (215,320) | (295,215) |  |
Total recognized in other comprehensive income | 915,495 | 1,130,815 |  |
Amounts recognized in accumulated other comprehensive income: |  |  |  |
Net actuarial loss |  |  | $ 913,870 | $ 1,128,647
Prior service cost |  |  | 1,625 | 2,168
Total | $ 1,130,815 | $ 1,426,030 | $ 915,495 | $ 1,130,815

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