Income Taxes, Continuing Operations - Reconciliation of Income Tax Provision from Continuing Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Computed "expected" tax	$ 676,000	$ 591,000
Increase in "expected" tax resulting from state income tax, net of federal income tax benefit	198,000	165,000
Nondeductible expenses and other	24,000	18,000
Total Income tax expense	$ 898,000	$ 774,000