Income Taxes (Significant components of the provision for income taxes) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal									$ 2,240,000	$ 2,800,000	$ 3,080,000
State									750,000	1,065,000	985,000
Total current	$ 970,000	$ 835,000	$ 905,000	$ 280,000	$ 1,475,000	$ 730,000	$ 1,260,000	$ 400,000	2,990,000	3,865,000	4,065,000
Deferred	(305,000)	275,000	345,000	70,000	(25,000)	565,000	315,000	80,000	385,000	935,000	195,000
Income tax provision	$ 665,000	$ 1,110,000	$ 1,250,000	$ 350,000	$ 1,450,000	$ 1,295,000	$ 1,575,000	$ 480,000	$ 3,375,000	$ 4,800,000	$ 4,260,000