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Summary of Activities in Shares of Capital Stock (Details) - shares | 9 Months Ended
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Sep. 30, 2022 | Sep. 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 | 111,608
Stock dividends, shares | 889,554 | 837,410
Conversion of class C to class A | 116,168 | 49,247
Common stock, shares, outstanding, ending | 18,717,540 | 17,594,048
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 | 131,553
Conversion of class C to class A | (116,168) | (49,247)
Common stock, shares, outstanding, ending | 2,889,859 | 2,761,909

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