Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 69,400,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	28,847,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	45,824,000
Real Estate And Accumulated Depreciation Buildings And Improvements	6,385,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Land	28,847,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Buildings and Improvements	52,209,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Total	81,056,000	$ 80,963,000	$ 80,908,000
SEC Schedule III, Real Estate Accumulated Depreciation	16,405,000	$ 13,629,000	$ 10,868,000
Deferred Offering Costs, Net	350,000
Paramus Nj
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	9,750,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	908,000
Real Estate Under Development	0
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,647,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate And Accumulated Depreciation Buildings And Improvements	6,136,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Land	908,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount Of Real Estate Under Development	0
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Buildings and Improvements	9,783,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Total	10,691,000
SEC Schedule III, Real Estate Accumulated Depreciation	$ 8,949,000
SEC Schedule III, Real Estate And Accumulated Depreciation Date of Acquisition 1	1980
SEC Schedule III, Real Estate And Accumulated Depreciation Date of Construction 1	1984
Brooklyn New York
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 59,650,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	27,939,000
Real Estate Under Development	0
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	42,177,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate And Accumulated Depreciation Buildings And Improvements	249,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Land	27,939,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount Of Real Estate Under Development	0
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Amount of Buildings and Improvements	42,426,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Carried Total	70,365,000
SEC Schedule III, Real Estate Accumulated Depreciation	$ 7,456,000
SEC Schedule III, Real Estate And Accumulated Depreciation Date of Acquisition 1	2018
SEC Schedule III, Real Estate And Accumulated Depreciation Date of Construction 1	2017
Maximum
Useful lives	39 years
Minimum
Useful lives	10 years