Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share

The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the years ended December 31, 2021, 2020 and 2019:

	Year Ended December 31,
	2021	2020	2019
Weighted average number of shares outstanding used to    calculate basic EPS	3,580,800	3,691,987	3,640,688
Dilutive securities:
Stock options and restricted share units	278,112	224,674	332,339
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	3,858,912	3,916,661	3,973,027

Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2021, 2020 and 2019, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

	Year Ended December 31,
	2021	2020	2019
Anti-dilutive securities	23,062	31,210	319,210