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Share-Based Compensation - Stock Options Activity (Details) - Stock options - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock Options
Options outstanding at beginning of period (in shares)	824,300	1,090,300
Granted (in shares)	0	0
Exercised (in shares)	(18,750)	(60,000)
Forfeited (in shares)	0	0
Options outstanding at end of period (in shares)	805,550	1,030,300
Options exercisable at end of period (in shares)	800,550	992,800

X

- 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Net number of share options (or share units) granted during the period.

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- Definition

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

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

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