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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 08, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 six 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. |
Aggregate amount permitted for share repurchases |  | $ 2,500,000 |
Payments for treasury stock |  | $ 265,106 | $ 1,107,064
Payments for treasury stock, shares |  | 55,128 |
Total leverage ratio |  | 3.50% |
Cash dividends paid |  | $ 5,388,512 | $ 5,137,470
Maximum [Member] |  |  |
Class of Stock [Line Items] |  |  |
Long-term debt covenants aggregate leverage ratio |  | 2.5 |
New Credit Agreement [Member] | Maximum [Member] |  |  |
Class of Stock [Line Items] |  |  |
Total leverage ratio |  | 3.75% |
Leverage Ratio Less Than 3.5 [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock to be repurchased when leverage rate is greater than threshold specified |  | $ 7,500,000 |
Leverage Ratio Greater Than or Equal to 3.5 [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock to be repurchased when leverage rate is greater than threshold specified |  | $ 10,000,000 |
Class A Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend declared per share |  | $ 0.05 |
Class B Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend declared per share |  | $ 0.05 |
Subsequent Event [Member] |  |  |
Class of Stock [Line Items] |  |  |
Cash dividends paid | $ 1,400,000 |  |

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