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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Summary of Changes in Shareholders' Equity | A summary of changes in shareholders’ equity is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, December 31, 2017 |  | $ | 206 |  |  | $ | 1,644,197 |  |  | $ | 6,231,940 |  |  | $ | (6,270,851 | ) |  | $ | (17,383 | ) |  | $ | 17,383 |  |  | $ | 1,605,492 |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  | — |  |  | — |  |  | 2,196 |  |  | — |  |  | — |  |  | — |  |  | 2,196 |
Net income |  | — |  |  | — |  |  | 369,223 |  |  | — |  |  | — |  |  | — |  |  | 369,223 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 235 |  |  | (235 | ) |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (483,538 | ) |  | — |  |  | — |  |  | (483,538 | )
Equity-based compensation |  | — |  |  | 28,104 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 28,104 |
Proceeds from Options exercised |  | — |  |  | 86,094 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 86,094 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (36,699 | ) |  | — |  |  | 36,699 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2018 |  | $ | 206 |  |  | $ | 1,721,696 |  |  | $ | 6,603,359 |  |  | $ | (6,717,690 | ) |  | $ | (17,148 | ) |  | $ | 17,148 |  |  | $ | 1,607,571 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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