Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Stock Option Plans - Schedule of Stock Option Activity (Details)

v3.21.1

Stock Option Plans - Schedule of Stock Option Activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Options Outstanding, Beginning balance	166,505	202,246
Options Exercisable, Beginning balance	166,536	192,108
Options, Canceled
Options, Granted
Options, Exercised
Options, Expired	(25,383)	(35,741)
Options Outstanding, Ending balance	141,122	166,505
Options Exercisable, Ending balance	135,934	166,536
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 85.81	$ 80.14
Weighted Average Exercise Price, Exercisable, Beginning balance	87.00	81.32
Weighted Average Exercise Price, Outstanding, Ending balance	99.08	85.81
Weighted Average Exercise Price, Exercisable, Ending balance	$ 100.89	$ 87.00
Weighted Average Remaining Contractual Term in Years, Outstanding Beginning		3 years 6 months 7 days
Weighted Average Remaining Contractual Term in Years, Exercisable, Beginning		3 years 3 months 4 days
Weighted Average Remaining Contractual Term in Years, Outstanding Ending	3 years 5 months 1 day	3 years 1 month 20 days
Weighted Average Remaining Contractual Term in Years, Exercisable, Ending	3 years 3 months 8 days	2 years 11 months 23 days
Aggregate Intrinsic Value, Outstanding Beginning balance
Aggregate Intrinsic Value, Exercisable Beginning balance
Aggregate Intrinsic Value, Outstanding Ending balance
Aggregate Intrinsic Value, Exercisable Ending balance

- Definition

Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term.

+ References

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- Definition

Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractua lTerm.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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