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Stock Options (Schedule of Restricted Stock Award Activity) (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of year (in shares)	78,705	75,636	63,052
Granted (in shares)	44,307	36,060	35,300
Exercised (in shares)	(31,594)	(32,466)	(22,266)
Canceled (in shares)	(375)	(525)	(450)
Outstanding at end of year (in shares)	91,043	78,705	75,636
Grant-Date Fair Value
Outstanding at beginning of year (in dollars per share)	$ 94.34	$ 81.39	$ 70.08
Granted (in dollars per share)	111.95	105.69	92.50
Exercised (in dollars per share)	88.90	69.94	66.91
Canceled (in dollars per share)	100.34	99.96	83.99
Outstanding at end of year (in dollars per share)	$ 104.77	$ 94.34	$ 81.39

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options.

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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Per share or unit weighted-average intrinsic value of award vested under share-based payment arrangement. Excludes share and unit options.

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