Income and Dividends Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	May 02, 2024
Anti-dilutive securities
Common stock, authorized shares	30,000,000
Common stock, shares outstanding	5,709,226
Income per share of common stock:
Net income for basic and diluted income per common share	$ 22,439	$ 17,104
Weighted-average shares for basic income per common share (in shares)	5,707,000	5,685,000
Effect of dilutive securities:
Employee and director stock options (in shares)	18,000	13,000
Adjusted weighted-average shares and assumed exercises for diluted income per common share (in shares)	5,725,000	5,698,000
Basic net income per common share (in dollars per share)	$ 3.93	$ 3.01
Diluted net income per common share (in dollars per share)	3.92	3.00
Cash dividends per share of common stock (in dollars per share)	$ 0.25	$ 0.20
Options
Anti-dilutive securities
Anti-dilutive shares of common stock excluded from the calculation of dilutive securities	0	0
Forecast
Anti-dilutive securities
Common stock, shares outstanding			45,000,000