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Summary of Activities in Shares of Capital Stock (Details) - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Common Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares, outstanding, beginning	17,642,722	16,595,783
Exercise of stock options	69,096	80,948
Stock dividends, shares	889,554	836,263
Conversion of class C to class A	77,316	48,527
Common stock, shares, outstanding, ending	18,678,688	17,561,521
Common Class C [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares, outstanding, beginning	2,866,565	2,679,603
Exercise of stock options
Stock dividends, shares	139,462	131,554
Conversion of class C to class A	(77,316)	(48,527)
Common stock, shares, outstanding, ending	2,928,711	2,762,630

X

- 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 issued as dividends during the period. Excludes stock splits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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