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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 08, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 08, 2015
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 |  | $ 254,405 | $ 377,480 |
Payments for treasury stock, shares |  | 51,275 |  |
Aggregate amount permitted for cash dividends and share repurchases in 2015 |  | $ 5,000,000 |  |
Aggregate amount permitted for cash dividends and share repurchases in 2016 and thereafter |  | 6,000,000 |  |
Cash dividends paid |  | $ 4,121,804 | $ 4,104,155 |
Dividend declared per share |  |  |  | $ 0.045
Subsequent Event [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash dividends paid | $ 1,000,000 |  |  |

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