Net Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net Earnings Per Share
Net earnings	$ 5,160,000	$ 4,888,000	$ 9,505,000	$ 8,836,000
Net Earnings
Effect of dilutive securities: Restricted stock units- unvested	0	0	0	0
Diluted earnings per common share	$ 5,160,000	$ 4,888,000	$ 9,505,000	$ 8,836,000
Weighted Average Number of Shares
Basic earnings per common share (in shares)	5,303,370	5,290,856	5,300,841	5,304,763
Effect of dilutive securities: Restricted stock units- unvested	10,771	19,886	10,563	19,015
Shares held in deferred comp plan by deferred compensation trust	156,071	165,608	154,522	164,975
Diluted earnings per common share (in shares)	5,470,212	5,476,350	5,465,926	5,488,753
Per Share Amount
Basic earnings per common share (in dollars per share)	$ 0.97	$ 0.93	$ 1.79	$ 1.67
Diluted earnings per common share (in dollars per share)	$ 0.95	$ 0.89	$ 1.74	$ 1.61