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Stockholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Condition of electing directors by class a and class b common stock vote | In the election of directors, the holders of Class A common stock are entitled by class vote, exclusive of other stockholders, to elect two of the Company’s directors, with each Class A share being entitled to one vote. In the election of the other seven directors and all other matters submitted to the stockholders for a vote, the holders of Class A shares and Class B shares shall vote as a single class, with each Class A share being entitled to one vote and each Class B share entitled to ten votes. |
Payments for treasury stock | $ 65,951 | $ 214,735
Payments for treasury stock, shares | 37,106 |
Cash dividends paid | $ 2,795,504 | $ 5,539,608

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