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Schedule II Valuation and qualifying accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for doubtful accounts - Tenant rent receivables      
Movement in valuation and qualifying accounts      
Balance at beginning of year $ 533,000 $ 505,000 $ 300,000
Additions (Decreases) charged to costs and expenses (38,000) 157,000 340,000
Deductions (478,000) (129,000) (135,000)
Balance at end of year 17,000 $ 533,000 505,000
Allowance for doubtful accounts - Straight-line rent receivable      
Movement in valuation and qualifying accounts      
Balance at beginning of year     50,000
Deductions     $ (50,000)
Allowance for doubtful accounts - Allowance for credit losses      
Movement in valuation and qualifying accounts      
Additions (Decreases) charged to costs and expenses 4,237,000    
Balance at end of year $ 4,237,000