Income Taxes, Continuing Operations - Reconciliation of Income Tax Provision from Continuing Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed "expected" tax	$ 591,000	$ 534,000
Increase in "expected" tax resulting from state income tax, net of federal income tax benefit	165,000	158,000
Nondeductible expenses and other	18,000	13,000
Total Income tax expense	$ 774,000	$ 705,000