Income Taxes, Continuing Operations - Deferred Tax Assets and Liabilities (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Gross deferred tax liabilities:
Property having a financial statement basis in excess of tax basis	$ 364,000	$ 364,000
Accounts receivable	57,000	52,000
Insurance premiums and accrued leasing revenues	47,000	49,000
Gross deferred tax liabilities	468,000	465,000
Gross deferred tax assets:
Prepaid rent	(47,000)	(40,000)
Accounts payable and accrued expenses	(61,000)	(49,000)
Accrued property taxes	(92,000)	(92,000)
Gross deferred tax assets	(200,000)	(181,000)
Deferred tax liabilities, net of deferred tax assets	$ 268,000	$ 284,000