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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares issued | 12,380,657 |  | 12,380,657 | 12,451,157 | 12,443,057 | 12,435,557
Common stock, shares outstanding | 12,380,657 |  | 12,380,657 | 12,451,157 | 12,443,057 | 12,435,557
Preferred stock, shares authorized | 1,000 |  | 1,000 | 1,000 |  |
Treasury stock purchases |  |  | 75,000 | 0 | 0 |
Purchase of common shares |  |  | 75,000 |  |  |
Shares available for purchase | 602,547 |  | 602,547 |  |  |
Common Stock Dividend declared by directors |  |  | $ 0.20 | $ 0.10 | $ 0.07 |
Class A Common Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares issued | 12,451,157 |  | 12,451,157 | 12,451,157 |  |
Common stock, shares outstanding | 12,380,657 |  | 12,380,657 | 12,380,657 |  |
Common stock, shares authorized | 20,000,000 |  | 20,000,000 | 20,000,000 |  |
Purchase of common shares | 25,000 | 50,000 | 75,000 |  |  |
Purchase of common shares value |  |  | $ 1.3 |  |  |
Class A Common Stock | 2013 Director Stock Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares available for award | 136,450 |  | 136,450 |  |  |
Class A Common Stock | Non-Employee | 2013 Director Stock Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock shares authorized to be issued under the plan |  |  | 200,000 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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