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Shareholders' Equity (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity [Abstract] |  |  |  |
Summary of Changes in Shareholders' Equity | A summary of changes in shareholders’ equity for the three months ended June 30, 2021 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2021 |  | $ | 206 |  |  | $ | 2,272,006 |  |  | $ | 9,059,882 |  |  | $ | (8,285,587) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 3,046,507 |
Net income |  | — |  |  | — |  |  | 321,295 |  |  | — |  |  | — |  |  | — |  |  | 321,295 |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (376,941) |  |  | — |  |  | — |  |  | (376,941) |
Equity-based compensation |  | — |  |  | 13,379 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13,379 |
Proceeds from Options exercised |  | — |  |  | 38,048 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 38,048 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (8,869) |  |  | — |  |  | 8,869 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2021 |  | $ | 206 |  |  | $ | 2,314,564 |  |  | $ | 9,381,177 |  |  | $ | (8,653,659) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 3,042,288 |
| A summary of changes in shareholders’ equity for the three months ended June 30, 2020 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2020 |  | $ | 206 |  |  | $ | 2,127,315 |  |  | $ | 8,085,575 |  |  | $ | (7,796,177) |  |  | $ | (16,912) |  |  | $ | 16,912 |  |  | $ | 2,416,919 |
Net income |  | — |  |  | — |  |  | 164,075 |  |  | — |  |  | — |  |  | — |  |  | 164,075 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 202 |  |  | (202) |  |  | — |
Equity-based compensation |  | — |  |  | 14,434 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 14,434 |
Proceeds from Options exercised |  | — |  |  | 16,984 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 16,984 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (7,110) |  |  | — |  |  | 7,110 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2020 |  | $ | 206 |  |  | $ | 2,151,623 |  |  | $ | 8,249,650 |  |  | $ | (7,789,067) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 2,612,412 |
| A summary of changes in shareholders’ equity for the six months ended June 30, 2021 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, December 31, 2020 |  | $ | 206 |  |  | $ | 2,214,426 |  |  | $ | 8,811,120 |  |  | $ | (7,922,678) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 3,103,074 |
Net income |  | — |  |  | — |  |  | 570,057 |  |  | — |  |  | — |  |  | — |  |  | 570,057 |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (754,366) |  |  | — |  |  | — |  |  | (754,366) |
Equity-based compensation |  | — |  |  | 27,850 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 27,850 |
Proceeds from Options exercised |  | — |  |  | 95,673 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 95,673 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (23,385) |  |  | — |  |  | 23,385 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2021 |  | $ | 206 |  |  | $ | 2,314,564 |  |  | $ | 9,381,177 |  |  | $ | (8,653,659) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 3,042,288 |
| A summary of changes in shareholders’ equity for the six months ended June 30, 2020 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, December 31, 2019 |  | $ | 206 |  |  | $ | 2,055,407 |  |  | $ | 7,909,872 |  |  | $ | (7,624,241) |  |  | $ | (16,912) |  |  | $ | 16,912 |  |  | $ | 2,341,244 |
Net income |  | — |  |  | — |  |  | 339,778 |  |  | — |  |  | — |  |  | — |  |  | 339,778 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 202 |  |  | (202) |  |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (216,582) |  |  | — |  |  | — |  |  | (216,582) |
Equity-based compensation |  | — |  |  | 21,926 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21,926 |
Proceeds from Options exercised |  | — |  |  | 126,046 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 126,046 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (51,756) |  |  | — |  |  | 51,756 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2020 |  | $ | 206 |  |  | $ | 2,151,623 |  |  | $ | 8,249,650 |  |  | $ | (7,789,067) |  |  | $ | (16,710) |  |  | $ | 16,710 |  |  | $ | 2,612,412 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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