Income Taxes (Narrative) (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
Income taxes
Net deferred tax liabilities	$ 1,350,000				$ 1,313,000				$ 1,350,000	$ 1,313,000
Income tax expense (benefit)	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
Income Tax Examination, Penalties and Interest Accrued	0				0				$ 0	$ 0
Effective income tax rate									26.20%	34.30%
Deferred compensation cost						$ 3,800,000
Income Tax Examination, Penalties and Interest Expense											$ 600
Deferred tax asset, valuation allowance	0				0				$ 0	$ 0
Unrecognized tax benefits, income tax penalties accrued	$ 0				$ 0				$ 0	$ 0