Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Income 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	$ 5,039	$ 4,387
Denominator [Abstract]
Weighted-average shares outstanding (in shares)	27,811,000	27,193,000
Basic net income per share (in dollars per share)	$ 0.18	$ 0.16
Numerator [Abstract]
Allocation of net income	$ 5,039	$ 4,387
Denominator [Abstract]
Number of shares used in basic computation (in shares)	27,811,000	27,193,000
Weighted-average shares effect of dilutive securities [Abstract]
Director and employee stock options (in shares)	35,000	173,000
Number of shares used in diluted computation (in shares)	27,846,000	27,366,000
Diluted net income per share (in dollars per share)	$ 0.18	$ 0.16
Class B Common Stock [Member]
Numerator [Abstract]
Allocation of net income	$ 917	$ 817
Denominator [Abstract]
Weighted-average shares outstanding (in shares)	5,577,000	5,577,000
Basic net income per share (in dollars per share)	$ 0.16	$ 0.15
Numerator [Abstract]
Allocation of net income	$ 917	$ 817
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 net income per share (in dollars per share)	$ 0.16	$ 0.15
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share [Abstract]
Number of options to purchase Class A shares excluded (in shares)	1,693,904	2,307,435