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Shareholders' Equity
 9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Shareholders' Equity Shareholders’ Equity
A summary of changes in shareholders’ equity for the three months ended September 30, 2022 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, June 30, 2022$206 $2,498,123 $10,907,253 $(10,413,916)$(16,710)$16,710 $2,991,666 
Net income— — 411,393 — — — 411,393 
Purchase of common stock for treasury— — — (368,490)— — (368,490)
Equity-based compensation— 26,686 — — — — 26,686 
Proceeds from Options exercised— 23,584 — — — — 23,584 
Treasury stock issued upon Option exercise — (9,581)— 9,581 — — — 
Balance, September 30, 2022$206 $2,538,812 $11,318,646 $(10,772,825)$(16,710)$16,710 $3,084,839 
A summary of changes in shareholders’ equity for the nine months ended September 30, 2022 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, December 31, 2021$206 $2,378,191 $10,047,839 $(9,423,858)$(16,710)$16,710 $3,002,378 
Net income— — 1,270,807 — — — 1,270,807 
Purchase of common stock for treasury— — — (1,384,193)— — (1,384,193)
Equity-based compensation— 58,441 — — — — 58,441 
Proceeds from Options exercised— 137,406 — — — — 137,406 
Treasury stock issued upon Option exercise — (35,226)— 35,226 — — — 
Balance, September 30, 2022$206 $2,538,812 $11,318,646 $(10,772,825)$(16,710)$16,710 $3,084,839 
We repurchased 88,016 and 295,148 shares of our outstanding common stock during the three and nine months ended September 30, 2022, respectively. We settle Option exercises and vesting of RSUs by issuing shares of treasury stock.  We issued 15,840 and 59,559 shares from the treasury account during the three and nine months ended September 30, 2022, respectively, in settlement of Option exercises.  Shares are relieved from the treasury account based on the weighted average cost basis of treasury shares.
A summary of changes in shareholders’ equity for the three months ended September 30, 2021 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, June 30, 2021$206 $2,314,564 $9,381,177 $(8,653,659)$(16,710)$16,710 $3,042,288 
Net income— — 332,081 — — — 332,081 
Purchase of common stock for treasury— — — (398,489)— — (398,489)
Equity-based compensation— 15,009 — — — — 15,009 
Proceeds from Options exercised— 26,162 — — — — 26,162 
Treasury stock issued upon Option exercise and RSU vesting— (6,735)— 6,735 — — — 
Balance, September 30, 2021$206 $2,349,000 $9,713,258 $(9,045,413)$(16,710)$16,710 $3,017,051 
A summary of changes in shareholders’ equity for the nine months ended September 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— — 902,138 — — — 902,138 
Purchase of common stock for treasury— — — (1,152,855)— — (1,152,855)
Equity-based compensation— 42,859 — — — — 42,859 
Proceeds from Options exercised— 121,835 — — — — 121,835 
Treasury stock issued upon Option exercise and RSU vesting— (30,120)— 30,120 — — — 
Balance, September 30, 2021$206 $2,349,000 $9,713,258 $(9,045,413)$(16,710)$16,710 $3,017,051 
We repurchased 79,620 and 244,595 shares of our outstanding common stock during the three and nine months ended September 30, 2021, respectively. We issued 13,116 and 61,704 shares from the treasury account during the three and nine months ended September 30, 2021, respectively, in settlement of Option exercises and vesting of RSUs.