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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
	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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- Definition

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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