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Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - Supplemental Employee Retirement Plan [Member] - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Amounts Recognized in Accumulated Other Comprehensive Income    
Net actuarial loss (gain) $ 593,326 $ (119,402)
Total (before tax effects) $ 593,326 $ (119,402)