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Summary of Activities in Shares of Capital Stock (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	16,595,783	16,107,779
Exercise of stock options	160,282	68,970
Stock dividends	837,410	405,210
Conversion of Class C to Class A	49,247	13,824
Common Stock, Shares, Outstanding	17,642,722	16,595,783
Common Class C [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding	2,679,603	2,500,887
Exercise of stock options	104,656	130,820
Stock dividends	131,553	61,720
Conversion of Class C to Class A	(49,247)	(13,824)
Common Stock, Shares, Outstanding	2,866,565	2,679,603

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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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Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan.

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Number of shares of common and preferred stock issued as dividends during the period. Excludes stock splits.

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