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Summary of Activities in Shares of Capital Stock (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Common Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares, outstanding, beginning	18,758,031	17,642,722
Exercise of stock options	48,046	50,223
Conversion of Class C to Class A	936	207
Common stock, shares, outstanding, ending	18,807,013	17,693,152
Common Class C [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares, outstanding, beginning	2,889,859	2,866,565
Exercise of stock options
Conversion of Class C to Class A	(936)	(207)
Common stock, shares, outstanding, ending	2,888,923	2,866,358

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- Definition

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

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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