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Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Credit facilities	$ 66,000,000	$ 175,000,000
Unamortized issuance costs	(3,278,000)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities	66,000,000.0
Continuing Operations [Member]
Debt Instrument [Line Items]
Total debt gross	530,451,000
Total debt	$ 527,173,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member]
Debt Instrument [Line Items]
Total debt gross	$ 164,451,000
Weighted average contractual interest rate	3.60%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Franklin Village [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2026
Total debt gross	$ 44,843,000
Weighted average contractual interest rate	3.90%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Shops at Suffolk Downs [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2031
Total debt gross	$ 15,600,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Trexlertown Plaza [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2031
Total debt gross	$ 36,100,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | The Point [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2031
Total debt gross	$ 29,700,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Christina Crossing [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2031
Total debt gross	$ 17,000,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Lawndale Plaza [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 30, 2031
Total debt gross	$ 15,600,000
Weighted average contractual interest rate	3.50%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Senator Square Finance Lease Obligation [Member]
Debt Instrument [Line Items]
Maturity date	Sep. 30, 2050
Total debt gross	$ 5,608,000
Weighted average contractual interest rate	5.30%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Three [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Apr. 30, 2023
Credit facilities	$ 100,000,000
Weighted average contractual interest rate	3.30%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Four [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Sep. 30, 2024
Credit facilities	$ 75,000,000
Weighted average contractual interest rate	3.80%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Five [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Jul. 31, 2025
Credit facilities	$ 75,000,000
Weighted average contractual interest rate	4.70%
Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Six [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Aug. 31, 2026
Credit facilities	$ 50,000,000
Weighted average contractual interest rate	3.30%
Continuing Operations [Member] | Variable-Rate Mortgage [Member] | Revolving Credit Facility [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Aug. 31, 2024
Credit facilities	$ 66,000,000
Weighted average contractual interest rate	1.60%

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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