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Schedule III - Real Estate and Accumulated Depreciation (Details) | 12 Months Ended |  |  |
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Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Gross Leasable Area | property |  | 7,285,779 |  |  |  |
Initial cost to the Company, Land |  | $ 262,286,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 798,333,000 |  |  |  |
Subsequent cost capitalized | [1] | 227,905,000 |  |  |  |
Gross carrying amount of Land |  | 259,968,000 |  |  |  |
Gross carrying amount of building and improvements |  | 1,028,556,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 1,288,524,000 | $ 1,527,478,000 | [2] | $ 1,515,206,000 | $ 1,508,682,000
Accumulated Depreciation |  | $ 409,742,000 | $ 428,569,000 |  | $ 389,861,000 | $ 361,969,000
Academy Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2001 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 136,685 |  |  |  |
Initial cost to the Company, Land |  | $ 2,406,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 9,623,000 |  |  |  |
Subsequent cost capitalized | [1] | 6,322,000 |  |  |  |
Gross carrying amount of Land |  | 2,406,000 |  |  |  |
Gross carrying amount of building and improvements |  | 15,945,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 18,351,000 |  |  |  |
Accumulated Depreciation |  | $ 7,175,000 |  |  |  |
Academy Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1965 |  |  |  |
Academy Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Big Y Shopping Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2013 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2007 |  |  |  |
Gross Leasable Area | property |  | 101,105 |  |  |  |
Initial cost to the Company, Land |  | $ 11,272,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 23,395,000 |  |  |  |
Subsequent cost capitalized | [1] | (838,000) |  |  |  |
Gross carrying amount of Land |  | 10,268,000 |  |  |  |
Gross carrying amount of building and improvements |  | 23,561,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 33,829,000 |  |  |  |
Accumulated Depreciation |  | $ 6,266,000 |  |  |  |
Carmans Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 182,081 |  |  |  |
Initial cost to the Company, Land |  | $ 8,539,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 35,804,000 |  |  |  |
Subsequent cost capitalized | [1] | 13,051,000 |  |  |  |
Gross carrying amount of Land |  | 8,421,000 |  |  |  |
Gross carrying amount of building and improvements |  | 48,973,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 57,394,000 |  |  |  |
Accumulated Depreciation |  | $ 19,451,000 |  |  |  |
Carmans Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1954 |  |  |  |
Carmans Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2007 |  |  |  |
Christina Crossing [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2017 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2008 |  |  |  |
Gross Leasable Area | property |  | 119,446 |  |  |  |
Initial cost to the Company, Land |  | $ 4,341,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 23,227,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,716,000 |  |  |  |
Gross carrying amount of Land |  | 4,341,000 |  |  |  |
Gross carrying amount of building and improvements |  | 24,943,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 29,284,000 |  |  |  |
Accumulated Depreciation |  | $ 4,558,000 |  |  |  |
Coliseum Marketplace [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 106,648 |  |  |  |
Initial cost to the Company, Land |  | $ 2,924,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 14,416,000 |  |  |  |
Subsequent cost capitalized | [1] | (3,050,000) |  |  |  |
Gross carrying amount of Land |  | 3,586,000 |  |  |  |
Gross carrying amount of building and improvements |  | 10,704,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 14,290,000 |  |  |  |
Accumulated Depreciation |  | $ 8,916,000 |  |  |  |
Coliseum Marketplace [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1987 |  |  |  |
Coliseum Marketplace [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2012 |  |  |  |
Colonial Commons [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2011 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 410,432 |  |  |  |
Initial cost to the Company, Land |  | $ 9,367,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 37,496,000 |  |  |  |
Subsequent cost capitalized | [1] | 8,026,000 |  |  |  |
Gross carrying amount of Land |  | 9,367,000 |  |  |  |
Gross carrying amount of building and improvements |  | 45,522,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 54,889,000 |  |  |  |
Accumulated Depreciation |  | $ 17,944,000 |  |  |  |
Colonial Commons [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2011 |  |  |  |
Colonial Commons [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Crossroads II [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2008 |  |  |  |
Percent Owned |  | 60.00% |  |  |  |
Year built/Year last renovated |  | 2009 |  |  |  |
Gross Leasable Area | property |  | 133,717 |  |  |  |
Initial cost to the Company, Land |  | $ 15,383,000 |  |  |  |
Subsequent cost capitalized | [1] | 29,794,000 |  |  |  |
Gross carrying amount of Land |  | 17,671,000 |  |  |  |
Gross carrying amount of building and improvements |  | 27,506,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 45,177,000 |  |  |  |
Accumulated Depreciation |  | $ 8,909,000 |  |  |  |
Elmhurst Square [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2006 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 66,254 |  |  |  |
Initial cost to the Company, Land |  | $ 1,371,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 5,994,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,299,000 |  |  |  |
Gross carrying amount of Land |  | 1,371,000 |  |  |  |
Gross carrying amount of building and improvements |  | 7,293,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,664,000 |  |  |  |
Accumulated Depreciation |  | $ 2,922,000 |  |  |  |
Elmhurst Square [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1961 |  |  |  |
Elmhurst Square [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1983 |  |  |  |
Fairview Commons [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 52,964 |  |  |  |
Initial cost to the Company, Land |  | $ 858,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 3,568,000 |  |  |  |
Subsequent cost capitalized | [1] | 461,000 |  |  |  |
Gross carrying amount of Land |  | 858,000 |  |  |  |
Gross carrying amount of building and improvements |  | 4,029,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 4,887,000 |  |  |  |
Accumulated Depreciation |  | $ 1,637,000 |  |  |  |
Fairview Commons [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1976 |  |  |  |
Fairview Commons [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2003 |  |  |  |
Fieldstone Marketplace [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 150,123 |  |  |  |
Initial cost to the Company, Land |  | $ 5,229,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 21,440,000 |  |  |  |
Subsequent cost capitalized | [1] | (3,367,000) |  |  |  |
Gross carrying amount of Land |  | 5,167,000 |  |  |  |
Gross carrying amount of building and improvements |  | 18,135,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 23,302,000 |  |  |  |
Accumulated Depreciation |  | $ 11,607,000 |  |  |  |
Fieldstone Marketplace [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Year built/Year last renovated |  | 1988 |  |  |  |
Fieldstone Marketplace [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2012 |  |  |  |
Year built/Year last renovated |  | 2003 |  |  |  |
Fishtown Crossing [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2001 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1988 |  |  |  |
Gross Leasable Area | property |  | 131,043 |  |  |  |
Initial cost to the Company, Land |  | $ 2,942,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 11,769,000 |  |  |  |
Subsequent cost capitalized | [1] | 13,892,000 |  |  |  |
Gross carrying amount of Land |  | 2,843,000 |  |  |  |
Gross carrying amount of building and improvements |  | 25,760,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 28,603,000 |  |  |  |
Accumulated Depreciation |  | $ 5,919,000 |  |  |  |
Frankin Village Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Percent Owned | [3] | 100.00% |  |  |  |
Gross Leasable Area | property | [3] | 305,937 |  |  |  |
Initial cost to the Company, Land | [3] | $ 14,270,000 |  |  |  |
Initial cost to the Company, Building and Improvements | [3] | 61,915,000 |  |  |  |
Subsequent cost capitalized | [1],[3] | 6,998,000 |  |  |  |
Gross carrying amount of Land | [3] | 14,681,000 |  |  |  |
Gross carrying amount of building and improvements | [3] | 68,502,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total | [3] | 83,183,000 |  |  |  |
Accumulated Depreciation | [3] | $ 21,479,000 |  |  |  |
Frankin Village Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired | [3] | 2004 |  |  |  |
Year built/Year last renovated | [3] | 1987 |  |  |  |
Frankin Village Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired | [3] | 2012 |  |  |  |
Year built/Year last renovated | [3] | 2005 |  |  |  |
General Booth Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1985 |  |  |  |
Gross Leasable Area | property |  | 71,639 |  |  |  |
Initial cost to the Company, Land |  | $ 1,935,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 9,493,000 |  |  |  |
Subsequent cost capitalized | [1] | (109,000) |  |  |  |
Gross carrying amount of Land |  | 1,935,000 |  |  |  |
Gross carrying amount of building and improvements |  | 9,384,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 11,319,000 |  |  |  |
Accumulated Depreciation |  | $ 3,819,000 |  |  |  |
Girard Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2019 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 35,688 |  |  |  |
Initial cost to the Company, Land |  | $ 4,685,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 4,648,000 |  |  |  |
Subsequent cost capitalized | [1] | (2,989,000) |  |  |  |
Gross carrying amount of Land |  | 4,685,000 |  |  |  |
Gross carrying amount of building and improvements |  | 1,659,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 6,344,000 |  |  |  |
Accumulated Depreciation |  | $ 649,000 |  |  |  |
Girard Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1950 |  |  |  |
Girard Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2010 |  |  |  |
Gold Star Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2006 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1988 |  |  |  |
Gross Leasable Area | property |  | 71,720 |  |  |  |
Initial cost to the Company, Land |  | $ 1,644,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 6,519,000 |  |  |  |
Subsequent cost capitalized | [1] | 802,000 |  |  |  |
Gross carrying amount of Land |  | 1,644,000 |  |  |  |
Gross carrying amount of building and improvements |  | 7,321,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 8,965,000 |  |  |  |
Accumulated Depreciation |  | $ 3,596,000 |  |  |  |
Golden Triangle [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 202,790 |  |  |  |
Initial cost to the Company, Land |  | $ 2,320,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 9,713,000 |  |  |  |
Subsequent cost capitalized | [1] | 12,672,000 |  |  |  |
Gross carrying amount of Land |  | 2,320,000 |  |  |  |
Gross carrying amount of building and improvements |  | 22,385,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 24,705,000 |  |  |  |
Accumulated Depreciation |  | $ 10,926,000 |  |  |  |
Golden Triangle [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1960 |  |  |  |
Golden Triangle [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2005 |  |  |  |
Groton Shopping Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1969 |  |  |  |
Gross Leasable Area | property |  | 130,264 |  |  |  |
Initial cost to the Company, Land |  | $ 3,070,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 12,320,000 |  |  |  |
Subsequent cost capitalized | [1] | 8,567,000 |  |  |  |
Gross carrying amount of Land |  | 3,113,000 |  |  |  |
Gross carrying amount of building and improvements |  | 20,844,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 23,957,000 |  |  |  |
Accumulated Depreciation |  | $ 7,142,000 |  |  |  |
Halifax Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1994 |  |  |  |
Gross Leasable Area | property |  | 51,510 |  |  |  |
Initial cost to the Company, Land |  | $ 1,412,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 5,799,000 |  |  |  |
Subsequent cost capitalized | [1] | 562,000 |  |  |  |
Gross carrying amount of Land |  | 1,347,000 |  |  |  |
Gross carrying amount of building and improvements |  | 6,426,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 7,773,000 |  |  |  |
Accumulated Depreciation |  | $ 3,216,000 |  |  |  |
Hamburg Square [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2004 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 102,058 |  |  |  |
Initial cost to the Company, Land |  | $ 1,153,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 4,678,000 |  |  |  |
Subsequent cost capitalized | [1] | 6,332,000 |  |  |  |
Gross carrying amount of Land |  | 1,153,000 |  |  |  |
Gross carrying amount of building and improvements |  | 11,010,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 12,163,000 |  |  |  |
Accumulated Depreciation |  | $ 4,560,000 |  |  |  |
Hamburg Square [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1993 |  |  |  |
Hamburg Square [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2010 |  |  |  |
Jordan Lane [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 174,679 |  |  |  |
Initial cost to the Company, Land |  | $ 4,291,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 21,176,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,537,000 |  |  |  |
Gross carrying amount of Land |  | 4,291,000 |  |  |  |
Gross carrying amount of building and improvements |  | 22,713,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 27,004,000 |  |  |  |
Accumulated Depreciation |  | $ 9,346,000 |  |  |  |
Jordan Lane [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1969 |  |  |  |
Jordan Lane [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1991 |  |  |  |
Kempsville Crossing [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 79,512 |  |  |  |
Initial cost to the Company, Land |  | $ 2,207,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 11,000,000 |  |  |  |
Subsequent cost capitalized | [1] | (2,837,000) |  |  |  |
Gross carrying amount of Land |  | 2,038,000 |  |  |  |
Gross carrying amount of building and improvements |  | 8,332,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 10,370,000 |  |  |  |
Accumulated Depreciation |  | $ 3,664,000 |  |  |  |
Kempsville Crossing [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1985 |  |  |  |
Kempsville Crossing [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Kings Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 168,243 |  |  |  |
Initial cost to the Company, Land |  | $ 2,413,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 12,604,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,933,000 |  |  |  |
Gross carrying amount of Land |  | 2,408,000 |  |  |  |
Gross carrying amount of building and improvements |  | 14,542,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 16,950,000 |  |  |  |
Accumulated Depreciation |  | $ 4,971,000 |  |  |  |
Kings Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1970 |  |  |  |
Kings Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1994 |  |  |  |
Lawndale Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2015 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1998 |  |  |  |
Gross Leasable Area | property |  | 92,773 |  |  |  |
Initial cost to the Company, Land |  | $ 3,635,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 21,854,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,092,000 |  |  |  |
Gross carrying amount of Land |  | 3,635,000 |  |  |  |
Gross carrying amount of building and improvements |  | 22,946,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 26,581,000 |  |  |  |
Accumulated Depreciation |  | $ 5,442,000 |  |  |  |
Meadows Marketplace [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2005 |  |  |  |
Gross Leasable Area | property |  | 91,518 |  |  |  |
Initial cost to the Company, Land |  | $ 1,914,000 |  |  |  |
Subsequent cost capitalized | [1] | 11,978,000 |  |  |  |
Gross carrying amount of Land |  | 1,914,000 |  |  |  |
Gross carrying amount of building and improvements |  | 11,978,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 13,892,000 |  |  |  |
Accumulated Depreciation |  | $ 4,651,000 |  |  |  |
Meadows Marketplace [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2004 |  |  |  |
Meadows Marketplace [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2012 |  |  |  |
Newport Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 1996 |  |  |  |
Gross Leasable Area | property |  | 64,489 |  |  |  |
Initial cost to the Company, Land |  | $ 1,721,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 7,758,000 |  |  |  |
Subsequent cost capitalized | [1] | 587,000 |  |  |  |
Gross carrying amount of Land |  | 1,682,000 |  |  |  |
Gross carrying amount of building and improvements |  | 8,384,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 10,066,000 |  |  |  |
Accumulated Depreciation |  | $ 4,183,000 |  |  |  |
New London Mall [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2009 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 259,566 |  |  |  |
Initial cost to the Company, Land |  | $ 14,891,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 24,967,000 |  |  |  |
Subsequent cost capitalized | [1] | 5,022,000 |  |  |  |
Gross carrying amount of Land |  | 8,807,000 |  |  |  |
Gross carrying amount of building and improvements |  | 36,073,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 44,880,000 |  |  |  |
Accumulated Depreciation |  | $ 16,240,000 |  |  |  |
New London Mall [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1967 |  |  |  |
New London Mall [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1997 |  |  |  |
Northside Commons [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2008 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2009 |  |  |  |
Gross Leasable Area | property |  | 69,136 |  |  |  |
Initial cost to the Company, Land |  | $ 3,332,000 |  |  |  |
Subsequent cost capitalized | [1] | 9,390,000 |  |  |  |
Gross carrying amount of Land |  | 3,379,000 |  |  |  |
Gross carrying amount of building and improvements |  | 9,343,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 12,722,000 |  |  |  |
Accumulated Depreciation |  | $ 3,124,000 |  |  |  |
Norwood Shopping Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2006 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 42,308 |  |  |  |
Initial cost to the Company, Land |  | $ 1,874,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 8,453,000 |  |  |  |
Subsequent cost capitalized | [1] | 5,128,000 |  |  |  |
Gross carrying amount of Land |  | 1,874,000 |  |  |  |
Gross carrying amount of building and improvements |  | 13,581,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 15,455,000 |  |  |  |
Accumulated Depreciation |  | $ 4,754,000 |  |  |  |
Norwood Shopping Center [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1965 |  |  |  |
Norwood Shopping Center [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Oak Ridge Shopping Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2006 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2000 |  |  |  |
Gross Leasable Area | property |  | 38,700 |  |  |  |
Initial cost to the Company, Land |  | $ 960,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 4,254,000 |  |  |  |
Subsequent cost capitalized | [1] | 478,000 |  |  |  |
Gross carrying amount of Land |  | 960,000 |  |  |  |
Gross carrying amount of building and improvements |  | 4,732,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 5,692,000 |  |  |  |
Accumulated Depreciation |  | $ 2,016,000 |  |  |  |
Oakland Commons [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 90,100 |  |  |  |
Initial cost to the Company, Land |  | $ 2,504,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 15,662,000 |  |  |  |
Subsequent cost capitalized | [1] | (3,466,000) |  |  |  |
Gross carrying amount of Land |  | 2,504,000 |  |  |  |
Gross carrying amount of building and improvements |  | 12,196,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 14,700,000 |  |  |  |
Accumulated Depreciation |  | $ 6,273,000 |  |  |  |
Oakland Commons [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1962 |  |  |  |
Oakland Commons [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Oakland Mills [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 57,008 |  |  |  |
Initial cost to the Company, Land |  | $ 1,611,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 6,292,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,145,000 |  |  |  |
Gross carrying amount of Land |  | 1,530,000 |  |  |  |
Gross carrying amount of building and improvements |  | 7,518,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 9,048,000 |  |  |  |
Accumulated Depreciation |  | $ 3,311,000 |  |  |  |
Oakland Mills [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1960 |  |  |  |
Oakland Mills [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2004 |  |  |  |
Palmyra Shopping Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 111,051 |  |  |  |
Initial cost to the Company, Land |  | $ 1,488,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 6,566,000 |  |  |  |
Subsequent cost capitalized | [1] | 2,156,000 |  |  |  |
Gross carrying amount of Land |  | 1,488,000 |  |  |  |
Gross carrying amount of building and improvements |  | 8,722,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 10,210,000 |  |  |  |
Accumulated Depreciation |  | $ 4,008,000 |  |  |  |
Palmyra Shopping Center [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1960 |  |  |  |
Palmyra Shopping Center [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2012 |  |  |  |
Pine Grove Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 79,306 |  |  |  |
Initial cost to the Company, Land |  | $ 2,010,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 6,489,000 |  |  |  |
Subsequent cost capitalized | [1] | 612,000 |  |  |  |
Gross carrying amount of Land |  | 1,622,000 |  |  |  |
Gross carrying amount of building and improvements |  | 7,489,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 9,111,000 |  |  |  |
Accumulated Depreciation |  | $ 3,618,000 |  |  |  |
Pine Grove Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2001 |  |  |  |
Pine Grove Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2002 |  |  |  |
Quartermaster Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2014 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2004 |  |  |  |
Gross Leasable Area | property |  | 456,154 |  |  |  |
Initial cost to the Company, Land |  | $ 37,031,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 54,210,000 |  |  |  |
Subsequent cost capitalized | [1] | 3,721,000 |  |  |  |
Gross carrying amount of Land |  | 37,031,000 |  |  |  |
Gross carrying amount of building and improvements |  | 57,931,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 94,962,000 |  |  |  |
Accumulated Depreciation |  | $ 14,798,000 |  |  |  |
San Souci Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2009 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 264,134 |  |  |  |
Initial cost to the Company, Land |  | $ 14,849,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 18,445,000 |  |  |  |
Subsequent cost capitalized | [1] | 5,195,000 |  |  |  |
Gross carrying amount of Land |  | 13,211,000 |  |  |  |
Gross carrying amount of building and improvements |  | 25,278,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 38,489,000 |  |  |  |
Accumulated Depreciation |  | $ 13,905,000 |  |  |  |
San Souci Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1985 |  |  |  |
San Souci Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1997 |  |  |  |
Shoppes at Arts District [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2016 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2011 |  |  |  |
Gross Leasable Area | property |  | 35,676 |  |  |  |
Initial cost to the Company, Land |  | $ 2,247,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 18,616,000 |  |  |  |
Subsequent cost capitalized | [1] | 91,000 |  |  |  |
Gross carrying amount of Land |  | 2,247,000 |  |  |  |
Gross carrying amount of building and improvements |  | 18,707,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 20,954,000 |  |  |  |
Accumulated Depreciation |  | $ 3,924,000 |  |  |  |
South Philadelphia [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 191,340 |  |  |  |
Initial cost to the Company, Land |  | $ 8,222,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 36,314,000 |  |  |  |
Subsequent cost capitalized | [1] | (3,839,000) |  |  |  |
Gross carrying amount of Land |  | 10,363,000 |  |  |  |
Gross carrying amount of building and improvements |  | 30,334,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 40,697,000 |  |  |  |
Accumulated Depreciation |  | $ 24,206,000 |  |  |  |
South Philadelphia [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1950 |  |  |  |
South Philadelphia [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2003 |  |  |  |
Southington Center [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 155,842 |  |  |  |
Initial cost to the Company, Building and Improvements |  | $ 11,834,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,456,000 |  |  |  |
Gross carrying amount of building and improvements |  | 13,290,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 13,290,000 |  |  |  |
Accumulated Depreciation |  | $ 5,822,000 |  |  |  |
Southington Center [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1972 |  |  |  |
Southington Center [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2000 |  |  |  |
Swede Square [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 100,809 |  |  |  |
Initial cost to the Company, Land |  | $ 2,268,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 6,232,000 |  |  |  |
Subsequent cost capitalized | [1] | 8,739,000 |  |  |  |
Gross carrying amount of Land |  | 2,272,000 |  |  |  |
Gross carrying amount of building and improvements |  | 14,967,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 17,239,000 |  |  |  |
Accumulated Depreciation |  | $ 6,787,000 |  |  |  |
Swede Square [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1980 |  |  |  |
Swede Square [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2012 |  |  |  |
The Brickyard [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2004 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 227,598 |  |  |  |
Initial cost to the Company, Land |  | $ 7,632,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 29,308,000 |  |  |  |
Subsequent cost capitalized | [1] | 576,000 |  |  |  |
Gross carrying amount of Land |  | 7,648,000 |  |  |  |
Gross carrying amount of building and improvements |  | 29,868,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 37,516,000 |  |  |  |
Accumulated Depreciation |  | $ 13,955,000 |  |  |  |
The Brickyard [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1990 |  |  |  |
The Brickyard [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2012 |  |  |  |
The Point [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2000 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 260,625 |  |  |  |
Initial cost to the Company, Land |  | $ 2,700,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 10,800,000 |  |  |  |
Subsequent cost capitalized | [1] | 20,418,000 |  |  |  |
Gross carrying amount of Land |  | 2,996,000 |  |  |  |
Gross carrying amount of building and improvements |  | 30,922,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 33,918,000 |  |  |  |
Accumulated Depreciation |  | $ 14,490,000 |  |  |  |
The Point [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1972 |  |  |  |
The Point [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2012 |  |  |  |
The Shops at Bloomfield Station [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2016 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Year built/Year last renovated |  | 2015 |  |  |  |
Gross Leasable Area | property |  | 63,844 |  |  |  |
Initial cost to the Company, Land |  | $ 625,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 17,674,000 |  |  |  |
Subsequent cost capitalized | [1] | (3,820,000) |  |  |  |
Gross carrying amount of Land |  | 625,000 |  |  |  |
Gross carrying amount of building and improvements |  | 13,854,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 14,479,000 |  |  |  |
Accumulated Depreciation |  | $ 3,756,000 |  |  |  |
Shops at Suffolk Downs [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 121,187 |  |  |  |
Initial cost to the Company, Land |  | $ 7,580,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 11,089,000 |  |  |  |
Subsequent cost capitalized | [1] | 10,633,000 |  |  |  |
Gross carrying amount of Land |  | 7,580,000 |  |  |  |
Gross carrying amount of building and improvements |  | 21,722,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 29,302,000 |  |  |  |
Accumulated Depreciation |  | $ 8,599,000 |  |  |  |
Shops at Suffolk Downs [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2005 |  |  |  |
Shops at Suffolk Downs [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2011 |  |  |  |
Timpany Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 182,799 |  |  |  |
Initial cost to the Company, Land |  | $ 3,412,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 19,240,000 |  |  |  |
Subsequent cost capitalized | [1] | (4,879,000) |  |  |  |
Gross carrying amount of Land |  | 3,368,000 |  |  |  |
Gross carrying amount of building and improvements |  | 14,405,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 17,773,000 |  |  |  |
Accumulated Depreciation |  | $ 7,651,000 |  |  |  |
Timpany Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1970 |  |  |  |
Timpany Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1989 |  |  |  |
Trexler Mall [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2005 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 336,687 |  |  |  |
Initial cost to the Company, Land |  | $ 6,932,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 32,815,000 |  |  |  |
Subsequent cost capitalized | [1] | 13,874,000 |  |  |  |
Gross carrying amount of Land |  | 6,932,000 |  |  |  |
Gross carrying amount of building and improvements |  | 46,689,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 53,621,000 |  |  |  |
Accumulated Depreciation |  | $ 18,349,000 |  |  |  |
Trexler Mall [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1973 |  |  |  |
Trexler Mall [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2013 |  |  |  |
Trexlertown Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2006 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 325,171 |  |  |  |
Initial cost to the Company, Land |  | $ 13,349,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 23,867,000 |  |  |  |
Subsequent cost capitalized | [1] | 31,090,000 |  |  |  |
Gross carrying amount of Land |  | 15,674,000 |  |  |  |
Gross carrying amount of building and improvements |  | 52,632,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 68,306,000 |  |  |  |
Accumulated Depreciation |  | $ 16,527,000 |  |  |  |
Trexlertown Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1990 |  |  |  |
Trexlertown Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2011 |  |  |  |
Valley Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2003 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 190,939 |  |  |  |
Initial cost to the Company, Land |  | $ 1,950,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 7,766,000 |  |  |  |
Subsequent cost capitalized | [1] | 5,370,000 |  |  |  |
Gross carrying amount of Land |  | 1,950,000 |  |  |  |
Gross carrying amount of building and improvements |  | 13,136,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 15,086,000 |  |  |  |
Accumulated Depreciation |  | $ 4,689,000 |  |  |  |
Valley Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1975 |  |  |  |
Valley Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1994 |  |  |  |
Washington Centers Shoppes [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2001 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 157,300 |  |  |  |
Initial cost to the Company, Land |  | $ 2,061,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 7,314,000 |  |  |  |
Subsequent cost capitalized | [1] | 7,159,000 |  |  |  |
Gross carrying amount of Land |  | 2,000,000 |  |  |  |
Gross carrying amount of building and improvements |  | 14,534,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 16,534,000 |  |  |  |
Accumulated Depreciation |  | $ 6,767,000 |  |  |  |
Washington Centers Shoppes [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1979 |  |  |  |
Washington Centers Shoppes [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1995 |  |  |  |
Webster Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 98,984 |  |  |  |
Initial cost to the Company, Land |  | $ 3,551,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 18,412,000 |  |  |  |
Subsequent cost capitalized | [1] | (1,656,000) |  |  |  |
Gross carrying amount of Land |  | 4,082,000 |  |  |  |
Gross carrying amount of building and improvements |  | 16,225,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 20,307,000 |  |  |  |
Accumulated Depreciation |  | $ 8,001,000 |  |  |  |
Webster Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1960 |  |  |  |
Webster Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2004 |  |  |  |
Yorktowne Plaza [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year acquired |  | 2007 |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Gross Leasable Area | property |  | 136,197 |  |  |  |
Initial cost to the Company, Land |  | $ 5,940,000 |  |  |  |
Initial cost to the Company, Building and Improvements |  | 25,505,000 |  |  |  |
Subsequent cost capitalized | [1] | (2,562,000) |  |  |  |
Gross carrying amount of Land |  | 5,801,000 |  |  |  |
Gross carrying amount of building and improvements |  | 23,082,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 28,883,000 |  |  |  |
Accumulated Depreciation |  | $ 10,734,000 |  |  |  |
Yorktowne Plaza [Member] | Minimum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 1970 |  |  |  |
Yorktowne Plaza [Member] | Maximum [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Year built/Year last renovated |  | 2000 |  |  |  |
Other [Member] |  |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Percent Owned |  | 100.00% |  |  |  |
Initial cost to the Company, Land |  | $ 1,965,000 |  |  |  |
Subsequent cost capitalized | [1] | 1,443,000 |  |  |  |
Gross carrying amount of Land |  | 879,000 |  |  |  |
Gross carrying amount of building and improvements |  | 2,529,000 |  |  |  |
SEC Schedule III, Real Estate, Gross, Total |  | 3,408,000 |  |  |  |
Accumulated Depreciation |  | $ 490,000 |  |  |  |
[1] | Negative amounts represent write-offs of fully depreciated assets and impairments.
[2] | At December 31, 2021, the aggregate cost for federal income tax purposes was approximately $34.5 million greater than the Company's recorded values.
[3] | Amount of encumbrance totals $164.2 million at December 31, 2021.

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