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Employee Benefit Plans - Summary of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Pension Plan [Member] |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |
Net actuarial (gain) loss |  | $ 191,102
Recognized actuarial (gain) loss due to settlements |  | 801,622
Total recognized in other comprehensive income (before tax effects) |  | 992,724
Total recognized in net benefit cost and other comprehensive income (before tax effects) |  | 219,384
Supplemental Employee Retirement Plan [Member] |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |
Net actuarial (gain) loss | $ 712,728 | (540,666)
Total recognized in other comprehensive income (before tax effects) | 712,728 | (540,666)
Total recognized in net benefit cost and other comprehensive income (before tax effects) | $ 1,053,030 | $ (221,523)

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