Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Minimum percentage of class A common stock declared dividend excess over class B dividend	10.00%
Class A Common Stock [Member]
Numerator: [Abstract]
Allocation of net income	$ 4,387	$ 10,986
Denominator: [Abstract]
Weighted-average shares outstanding (in shares)	27,193,000	25,787,000
Basic earnings per share (in dollars per share)	$ 0.16	$ 0.43
Numerator: [Abstract]
Allocation of net income	$ 4,387	$ 10,986
Denominator: [Abstract]
Number of shares used in basic computation (in shares)	27,193,000	25,787,000
Weighted-average shares effect of dilutive securities [Abstract]
Director and employee stock options (in shares)	173,000	22,000
Number of shares used in diluted computation (in shares)	27,366,000	25,809,000
Diluted earnings per share (in dollars per share)	$ 0.16	$ 0.43
Class B Common Stock [Member]
Numerator: [Abstract]
Allocation of net income	$ 817	$ 2,159
Denominator: [Abstract]
Weighted-average shares outstanding (in shares)	5,577,000	5,577,000
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.39
Numerator: [Abstract]
Allocation of net income	$ 817	$ 2,159
Denominator: [Abstract]
Number of shares used in basic computation (in shares)	5,577,000	5,577,000
Weighted-average shares effect of dilutive securities [Abstract]
Director and employee stock options (in shares)	0	0
Number of shares used in diluted computation (in shares)	5,577,000	5,577,000
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.39
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share [Abstract]
Number of options to purchase Class A shares excluded (in shares)	2,307,435	5,434,934