Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ 3,522	$ 1,694	$ 8,561	$ 6,085
Denominator [Abstract]
Weighted-average shares outstanding (in shares)	27,845,000	27,382,000	27,828,000	27,288,000
Basic net income per share (in dollars per share)	$ 0.13	$ 0.06	$ 0.31	$ 0.22
Numerator [Abstract]
Allocation of net income	$ 3,522	$ 1,694	$ 8,561	$ 6,085
Denominator [Abstract]
Number of shares used in basic computation (in shares)	27,845,000	27,382,000	27,828,000	27,288,000
Weighted-average shares effect of dilutive securities [Abstract]
Director and employee stock options (in shares)	0	107,000	18,000	140,000
Number of shares used in diluted computation (in shares)	27,845,000	27,489,000	27,846,000	27,428,000
Diluted net income per share (in dollars per share)	$ 0.13	$ 0.06	$ 0.31	$ 0.22
Class B Common Stock [Member]
Numerator [Abstract]
Allocation of net income	$ 631	$ 303	$ 1,547	$ 1,116
Denominator [Abstract]
Weighted-average shares outstanding (in shares)	5,577,000	5,577,000	5,577,000	5,577,000
Basic net income per share (in dollars per share)	$ 0.11	$ 0.05	$ 0.28	$ 0.2
Numerator [Abstract]
Allocation of net income	$ 631	$ 303	$ 1,547	$ 1,116
Denominator [Abstract]
Number of shares used in basic computation (in shares)	5,577,000	5,577,000	5,577,000	5,577,000
Weighted-average shares effect of dilutive securities [Abstract]
Director and employee stock options (in shares)	0	0	0	0
Number of shares used in diluted computation (in shares)	5,577,000	5,577,000	5,577,000	5,577,000
Diluted net income per share (in dollars per share)	$ 0.11	$ 0.05	$ 0.28	$ 0.2
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share [Abstract]
Number of options to purchase Class A shares excluded (in shares)	4,942	2,262	1,697	2,262