Capital Stock, Stock Awards, and Stock Options (Options Outstanding and Exercisable) (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	190,931	183,189
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	6 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 604.65	$ 569.31
Options Exercisable, Shares Exercisable	100,804
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	4 years
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 741.45
Exercise Price $244 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 244
Options Outstanding, Shares Outstanding	1,931
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	1 year 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 243.85
Options Exercisable, Shares Exercisable	1,931
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	1 year 10 months 24 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 243.85
Exercise Price $427 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 427
Options Outstanding, Shares Outstanding	85,000
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	9 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 426.86
Exercise Price $719 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 719
Options Outstanding, Shares Outstanding	77,258
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	3 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 719.15
Options Exercisable, Shares Exercisable	77,258
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	3 years 9 months 18 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 719.15
Exercise Price Range of $805-$872 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	26,742
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	5 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 865.02
Options Exercisable, Shares Exercisable	21,615
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	4 years 10 months 24 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 865.62
Exercise Price Range of $805-$872 [Member] | Minimum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	805
Exercise Price Range of $805-$872 [Member] | Maximum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 872