Mortgages Payable (Details)	Dec. 31, 2021 USD ($) Property	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Accumulated amortization	$ 19,377,000	$ 17,294,000
Debt costs, net of accumulated amortization	(7,443,000)	(1,917,000)
Long-term Debt, Fiscal Year Maturity [Abstract]
Mortgages payable, including unamortized premium and net of unamortized debt costs	10,697,000	11,395,000
Mortgages [Member]
Debt Instrument [Line Items]
Debt costs	(147,000)	(147,000)
Accumulated amortization	125,000	108,000
Debt costs, net of accumulated amortization	(22,000)	(39,000)
Mortgages payable, including unamortized premium and net of unamortized debt costs	10,697,000	11,395,000
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	750,000
2023	9,969,000
Mortgages payable, including unamortized premium and net of unamortized debt costs	10,719,000
Mortgages [Member] | November 2014
Debt Instrument [Line Items]
Initial Balance	$ 15,151,000
Interest Rate	5.23%
Carrying Value of Encumbered Asset(s)	$ 18,972,000
Outstanding Principal Balance	$ 10,719,000	$ 11,434,000
Number of encumbered assets | Property	5