Properties and Equipment - Properties and Equipment (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Properties on lease or held for lease, gross	$ 7,021,000	$ 7,021,000
Less accumulated depreciation	458,000	437,000
Properties and equipment net	6,563,000	6,584,000
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Properties on lease or held for lease, gross	4,439,000	4,439,000
Building and Improvements, Steeple Street [Member]
Property, Plant and Equipment [Line Items]
Properties on lease or held for lease, gross	2,582,000	2,582,000
Land Improvements on Lease or Held for Lease [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	93,000	93,000
Steeple Street Property [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ 365,000	$ 344,000