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Schedule III - Real Estate And Accumulated Depreciation (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Gross Leasable Area | property 9,127,793      
Initial cost to the Company, Land $ 306,824,000      
Initial cost to the Company, Building and Improvements 948,982,000      
Subsequent cost capitalized [1] 240,623,000      
Gross carrying amount of Land 301,299,000      
Gross carrying amount of building and improvements 1,195,130,000      
SEC Schedule III, Real Estate, Gross, Total 1,496,429,000 [2] $ 1,550,027,000 $ 1,476,173,000 $ 1,450,951,000
Accumulated Depreciation 313,070,000 $ 300,832,000 $ 267,211,000 $ 251,605,000
Amount of Encumbrance $ 138,243,000      
Academy Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2001      
Percent Owned 100.00%      
Gross Leasable Area | property 137,415      
Initial cost to the Company, Land $ 2,406,000      
Initial cost to the Company, Building and Improvements 9,623,000      
Subsequent cost capitalized [1] 4,565,000      
Gross carrying amount of Land 2,406,000      
Gross carrying amount of building and improvements 14,188,000      
SEC Schedule III, Real Estate, Gross, Total 16,594,000      
Accumulated Depreciation $ 4,907,000      
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] 11,000      
Gross carrying amount of Land 10,268,000      
Gross carrying amount of building and improvements 24,410,000      
SEC Schedule III, Real Estate, Gross, Total 34,678,000      
Accumulated Depreciation $ 2,601,000      
Camp Hill [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2002      
Percent Owned 100.00%      
Gross Leasable Area | property 463,967      
Initial cost to the Company, Land $ 4,460,000      
Initial cost to the Company, Building and Improvements 17,857,000      
Subsequent cost capitalized [1] 44,498,000      
Gross carrying amount of Land 4,424,000      
Gross carrying amount of building and improvements 62,391,000      
SEC Schedule III, Real Estate, Gross, Total 66,815,000      
Accumulated Depreciation $ 19,663,000      
Camp Hill [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1958      
Camp Hill [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2005      
Carll's Corner [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 129,582      
Initial cost to the Company, Land $ 3,034,000      
Initial cost to the Company, Building and Improvements 15,293,000      
Subsequent cost capitalized [1] (433,000)      
Gross carrying amount of Land 2,898,000      
Gross carrying amount of building and improvements 14,996,000      
SEC Schedule III, Real Estate, Gross, Total 17,894,000      
Accumulated Depreciation $ 4,614,000      
Carll's Corner [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1960      
Carll's Corner [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1999      
Carmans Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 193,736      
Initial cost to the Company, Land $ 8,539,000      
Initial cost to the Company, Building and Improvements 35,804,000      
Subsequent cost capitalized [1] 517,000      
Gross carrying amount of Land 8,421,000      
Gross carrying amount of building and improvements 36,439,000      
SEC Schedule III, Real Estate, Gross, Total 44,860,000      
Accumulated Depreciation $ 10,394,000      
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      
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] 5,426,000      
Gross carrying amount of Land 3,586,000      
Gross carrying amount of building and improvements 19,180,000      
SEC Schedule III, Real Estate, Gross, Total 22,766,000      
Accumulated Depreciation $ 6,361,000      
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 461,914      
Initial cost to the Company, Land $ 9,367,000      
Initial cost to the Company, Building and Improvements 37,496,000      
Subsequent cost capitalized [1] 5,222,000      
Gross carrying amount of Land 9,367,000      
Gross carrying amount of building and improvements 42,718,000      
SEC Schedule III, Real Estate, Gross, Total 52,085,000      
Accumulated Depreciation 10,079,000      
Amount of Encumbrance $ 25,070,000      
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] 28,968,000      
Gross carrying amount of Land 17,671,000      
Gross carrying amount of building and improvements 26,680,000      
SEC Schedule III, Real Estate, Gross, Total 44,351,000      
Accumulated Depreciation $ 5,140,000      
East River Park [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2015      
Percent Owned 100.00%      
Gross Leasable Area | property 150,107      
Initial cost to the Company, Land $ 9,143,000      
Initial cost to the Company, Building and Improvements 30,893,000      
Subsequent cost capitalized [1] 378,000      
Gross carrying amount of Land 9,398,000      
Gross carrying amount of building and improvements 31,016,000      
SEC Schedule III, Real Estate, Gross, Total 40,414,000      
Accumulated Depreciation 1,662,000      
Amount of Encumbrance $ 19,848,000      
East River Park [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1946      
East River Park [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1996      
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] 423,000      
Gross carrying amount of Land 1,371,000      
Gross carrying amount of building and improvements 6,417,000      
SEC Schedule III, Real Estate, Gross, Total 7,788,000      
Accumulated Depreciation $ 1,704,000      
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] 346,000      
Gross carrying amount of Land 858,000      
Gross carrying amount of building and improvements 3,914,000      
SEC Schedule III, Real Estate, Gross, Total 4,772,000      
Accumulated Depreciation $ 860,000      
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 151,995      
Initial cost to the Company, Land $ 5,229,000      
Initial cost to the Company, Building and Improvements 21,440,000      
Subsequent cost capitalized [1] 1,969,000      
Gross carrying amount of Land 5,167,000      
Gross carrying amount of building and improvements 23,471,000      
SEC Schedule III, Real Estate, Gross, Total 28,638,000      
Accumulated Depreciation $ 7,951,000      
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      
Fort Washington Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2002      
Percent Owned 100.00%      
Year built/Year last renovated 2003      
Gross Leasable Area | property 41,000      
Initial cost to the Company, Land $ 2,462,000      
Subsequent cost capitalized [1] 5,176,000      
Gross carrying amount of Land 2,462,000      
Gross carrying amount of building and improvements 5,176,000      
SEC Schedule III, Real Estate, Gross, Total 7,638,000      
Accumulated Depreciation $ 2,055,000      
Franklin Village Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Percent Owned 100.00%      
Gross Leasable Area | property 303,144      
Initial cost to the Company, Land $ 14,270,000      
Initial cost to the Company, Building and Improvements 61,915,000      
Subsequent cost capitalized [1] 1,486,000      
Gross carrying amount of Land 14,681,000      
Gross carrying amount of building and improvements 62,990,000      
SEC Schedule III, Real Estate, Gross, Total 77,671,000      
Accumulated Depreciation 10,313,000      
Amount of Encumbrance $ 49,097,000      
Franklin Village Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Year built/Year last renovated 1987      
Franklin Village Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2012      
Year built/Year last renovated 2005      
Fredericksburg Way [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Year built/Year last renovated 1997      
Gross Leasable Area | property 63,000      
Initial cost to the Company, Land $ 3,213,000      
Initial cost to the Company, Building and Improvements 12,758,000      
Gross carrying amount of Land 3,213,000      
Gross carrying amount of building and improvements 12,758,000      
SEC Schedule III, Real Estate, Gross, Total 15,971,000      
Accumulated Depreciation $ 4,131,000      
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] (947,000)      
Gross carrying amount of Land 1,935,000      
Gross carrying amount of building and improvements 8,546,000      
SEC Schedule III, Real Estate, Gross, Total 10,481,000      
Accumulated Depreciation $ 2,465,000      
Glen Allen Shopping Center [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Year built/Year last renovated 2000      
Gross Leasable Area | property 63,328      
Initial cost to the Company, Land $ 6,769,000      
Initial cost to the Company, Building and Improvements 683,000      
Subsequent cost capitalized [1] (212,000)      
Gross carrying amount of Land 5,367,000      
Gross carrying amount of building and improvements 1,873,000      
SEC Schedule III, Real Estate, Gross, Total 7,240,000      
Accumulated Depreciation $ 524,000      
Glenwood Village [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] 66,000      
Gross carrying amount of Land 625,000      
Gross carrying amount of building and improvements 17,740,000      
SEC Schedule III, Real Estate, Gross, Total 18,365,000      
Accumulated Depreciation $ 370,000      
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] 598,000      
Gross carrying amount of Land 1,644,000      
Gross carrying amount of building and improvements 7,117,000      
SEC Schedule III, Real Estate, Gross, Total 8,761,000      
Accumulated Depreciation $ 2,518,000      
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] 9,517,000      
Gross carrying amount of Land 2,320,000      
Gross carrying amount of building and improvements 19,230,000      
SEC Schedule III, Real Estate, Gross, Total 21,550,000      
Accumulated Depreciation $ 7,807,000      
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 121,825      
Initial cost to the Company, Land $ 3,070,000      
Initial cost to the Company, Building and Improvements 12,320,000      
Subsequent cost capitalized [1] 4,045,000      
Gross carrying amount of Land 3,113,000      
Gross carrying amount of building and improvements 16,322,000      
SEC Schedule III, Real Estate, Gross, Total 19,435,000      
Accumulated Depreciation $ 3,922,000      
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] 367,000      
Gross carrying amount of Land 1,347,000      
Gross carrying amount of building and improvements 6,231,000      
SEC Schedule III, Real Estate, Gross, Total 7,578,000      
Accumulated Depreciation $ 2,308,000      
Hamburg Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Percent Owned 100.00%      
Gross Leasable Area | property 99,580      
Initial cost to the Company, Land $ 1,153,000      
Initial cost to the Company, Building and Improvements 4,678,000      
Subsequent cost capitalized [1] 5,518,000      
Gross carrying amount of Land 1,153,000      
Gross carrying amount of building and improvements 10,196,000      
SEC Schedule III, Real Estate, Gross, Total 11,349,000      
Accumulated Depreciation $ 3,038,000      
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 177,504      
Initial cost to the Company, Land $ 4,291,000      
Initial cost to the Company, Building and Improvements 21,176,000      
Subsequent cost capitalized [1] 242,000      
Gross carrying amount of Land 4,291,000      
Gross carrying amount of building and improvements 21,418,000      
SEC Schedule III, Real Estate, Gross, Total 25,709,000      
Accumulated Depreciation $ 6,043,000      
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] (3,227,000)      
Gross carrying amount of Land 2,207,000      
Gross carrying amount of building and improvements 7,773,000      
SEC Schedule III, Real Estate, Gross, Total 9,980,000      
Accumulated Depreciation $ 2,470,000      
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] (537,000)      
Gross carrying amount of Land 2,408,000      
Gross carrying amount of building and improvements 12,072,000      
SEC Schedule III, Real Estate, Gross, Total 14,480,000      
Accumulated Depreciation $ 2,885,000      
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 93,040      
Initial cost to the Company, Land $ 3,635,000      
Initial cost to the Company, Building and Improvements 21,854,000      
Subsequent cost capitalized [1] 436,000      
Gross carrying amount of Land 3,635,000      
Gross carrying amount of building and improvements 22,290,000      
SEC Schedule III, Real Estate, Gross, Total 25,925,000      
Accumulated Depreciation $ 1,665,000      
Maxatawny Marketplace [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2011      
Percent Owned 100.00%      
Year built/Year last renovated 2014      
Gross Leasable Area | property 59,939      
Initial cost to the Company, Land $ 1,612,000      
Subsequent cost capitalized [1] 9,066,000      
Gross carrying amount of Land 1,454,000      
Gross carrying amount of building and improvements 9,224,000      
SEC Schedule III, Real Estate, Gross, Total 10,678,000      
Accumulated Depreciation $ 879,000      
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] 11,425,000      
Gross carrying amount of Land 1,914,000      
Gross carrying amount of building and improvements 11,425,000      
SEC Schedule III, Real Estate, Gross, Total 13,339,000      
Accumulated Depreciation $ 3,160,000      
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      
Mechanicsburg Giant [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Year built/Year last renovated 2003      
Gross Leasable Area | property 51,500      
Initial cost to the Company, Land $ 2,709,000      
Initial cost to the Company, Building and Improvements 12,159,000      
Gross carrying amount of Land 2,709,000      
Gross carrying amount of building and improvements 12,159,000      
SEC Schedule III, Real Estate, Gross, Total 14,868,000      
Accumulated Depreciation $ 3,802,000      
Metro Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2008      
Percent Owned 100.00%      
Year built/Year last renovated 1999      
Gross Leasable Area | property 71,896      
Initial cost to the Company, Land $ 3,121,000      
Initial cost to the Company, Building and Improvements 12,341,000      
Subsequent cost capitalized [1] (247,000)      
Gross carrying amount of Land 5,250,000      
Gross carrying amount of building and improvements 9,965,000      
SEC Schedule III, Real Estate, Gross, Total 15,215,000      
Accumulated Depreciation 2,445,000      
Amount of Encumbrance $ 7,344,000      
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] 401,000      
Gross carrying amount of Land 1,682,000      
Gross carrying amount of building and improvements 8,198,000      
SEC Schedule III, Real Estate, Gross, Total 9,880,000      
Accumulated Depreciation $ 2,942,000      
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] 1,532,000      
Gross carrying amount of Land 8,807,000      
Gross carrying amount of building and improvements 32,583,000      
SEC Schedule III, Real Estate, Gross, Total 41,390,000      
Accumulated Depreciation $ 10,743,000      
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] 10,010,000      
Gross carrying amount of Land 3,379,000      
Gross carrying amount of building and improvements 9,963,000      
SEC Schedule III, Real Estate, Gross, Total 13,342,000      
Accumulated Depreciation $ 1,832,000      
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 97,756      
Initial cost to the Company, Land $ 1,874,000      
Initial cost to the Company, Building and Improvements 8,453,000      
Subsequent cost capitalized [1] 735,000      
Gross carrying amount of Land 1,874,000      
Gross carrying amount of building and improvements 9,188,000      
SEC Schedule III, Real Estate, Gross, Total 11,062,000      
Accumulated Depreciation $ 2,366,000      
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] 46,000      
Gross carrying amount of Land 960,000      
Gross carrying amount of building and improvements 4,300,000      
SEC Schedule III, Real Estate, Gross, Total 5,260,000      
Accumulated Depreciation $ 1,340,000      
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] (344,000)      
Gross carrying amount of Land 2,504,000      
Gross carrying amount of building and improvements 15,318,000      
SEC Schedule III, Real Estate, Gross, Total 17,822,000      
Accumulated Depreciation $ 4,352,000      
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 58,224      
Initial cost to the Company, Land $ 1,611,000      
Initial cost to the Company, Building and Improvements 6,292,000      
Subsequent cost capitalized [1] 41,000      
Gross carrying amount of Land 1,611,000      
Gross carrying amount of building and improvements 6,333,000      
SEC Schedule III, Real Estate, Gross, Total 7,944,000      
Accumulated Depreciation $ 2,408,000      
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] 1,700,000      
Gross carrying amount of Land 1,488,000      
Gross carrying amount of building and improvements 8,266,000      
SEC Schedule III, Real Estate, Gross, Total 9,754,000      
Accumulated Depreciation $ 2,780,000      
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 86,089      
Initial cost to the Company, Land $ 2,010,000      
Initial cost to the Company, Building and Improvements 6,489,000      
Subsequent cost capitalized [1] 767,000      
Gross carrying amount of Land 2,010,000      
Gross carrying amount of building and improvements 7,256,000      
SEC Schedule III, Real Estate, Gross, Total 9,266,000      
Accumulated Depreciation $ 2,362,000      
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      
Port Richmond Village [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 154,908      
Initial cost to the Company, Land $ 2,942,000      
Initial cost to the Company, Building and Improvements 11,769,000      
Subsequent cost capitalized [1] 1,588,000      
Gross carrying amount of Land 2,843,000      
Gross carrying amount of building and improvements 13,456,000      
SEC Schedule III, Real Estate, Gross, Total 16,299,000      
Accumulated Depreciation $ 5,342,000      
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 456,602      
Initial cost to the Company, Land $ 37,031,000      
Initial cost to the Company, Building and Improvements 54,210,000      
Subsequent cost capitalized [1] 812,000      
Gross carrying amount of Land 37,031,000      
Gross carrying amount of building and improvements 55,022,000      
SEC Schedule III, Real Estate, Gross, Total 92,053,000      
Accumulated Depreciation $ 5,142,000      
River View Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 236,217      
Initial cost to the Company, Land $ 9,718,000      
Initial cost to the Company, Building and Improvements 40,356,000      
Subsequent cost capitalized [1] 5,309,000      
Gross carrying amount of Land 9,718,000      
Gross carrying amount of building and improvements 45,665,000      
SEC Schedule III, Real Estate, Gross, Total 55,383,000      
Accumulated Depreciation $ 15,689,000      
River View Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1991      
River View Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1998      
San Souci Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2009      
Percent Owned 40.00%      
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] 2,425,000      
Gross carrying amount of Land 13,406,000      
Gross carrying amount of building and improvements 22,313,000      
SEC Schedule III, Real Estate, Gross, Total 35,719,000      
Accumulated Depreciation $ 9,501,000      
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      
Gross carrying amount of Land 2,247,000      
Gross carrying amount of building and improvements 18,616,000      
SEC Schedule III, Real Estate, Gross, Total 20,863,000      
Accumulated Depreciation 503,000      
Amount of Encumbrance $ 9,044,000      
South Philadelphia [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 283,415      
Initial cost to the Company, Land $ 8,222,000      
Initial cost to the Company, Building and Improvements 36,314,000      
Subsequent cost capitalized [1] 2,815,000      
Gross carrying amount of Land 8,222,000      
Gross carrying amount of building and improvements 39,129,000      
SEC Schedule III, Real Estate, Gross, Total 47,351,000      
Accumulated Depreciation $ 15,534,000      
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] 233,000      
Gross carrying amount of building and improvements 12,067,000      
SEC Schedule III, Real Estate, Gross, Total 12,067,000      
Accumulated Depreciation $ 4,039,000      
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      
Suffolk Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Year built/Year last renovated 1984      
Gross Leasable Area | property 67,216      
Initial cost to the Company, Land $ 1,402,000      
Initial cost to the Company, Building and Improvements 7,236,000      
Subsequent cost capitalized [1] (1,301,000)      
Gross carrying amount of Land 1,402,000      
Gross carrying amount of building and improvements 5,935,000      
SEC Schedule III, Real Estate, Gross, Total 7,337,000      
Accumulated Depreciation $ 1,701,000      
Swede Square [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2003      
Percent Owned 100.00%      
Gross Leasable Area | property 100,816      
Initial cost to the Company, Land $ 2,268,000      
Initial cost to the Company, Building and Improvements 6,232,000      
Subsequent cost capitalized [1] 5,726,000      
Gross carrying amount of Land 2,272,000      
Gross carrying amount of building and improvements 11,954,000      
SEC Schedule III, Real Estate, Gross, Total 14,226,000      
Accumulated Depreciation $ 4,930,000      
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] 3,903,000      
Gross carrying amount of Land 7,648,000      
Gross carrying amount of building and improvements 33,195,000      
SEC Schedule III, Real Estate, Gross, Total 40,843,000      
Accumulated Depreciation $ 9,370,000      
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 Commons [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2004      
Percent Owned 100.00%      
Year built/Year last renovated 2003      
Gross Leasable Area | property 203,426      
Initial cost to the Company, Land $ 3,098,000      
Initial cost to the Company, Building and Improvements 14,047,000      
Subsequent cost capitalized [1] 3,093,000      
Gross carrying amount of Land 3,098,000      
Gross carrying amount of building and improvements 17,140,000      
SEC Schedule III, Real Estate, Gross, Total 20,238,000      
Accumulated Depreciation $ 6,364,000      
The Point [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2000      
Percent Owned 100.00%      
Gross Leasable Area | property 268,037      
Initial cost to the Company, Land $ 2,700,000      
Initial cost to the Company, Building and Improvements 10,800,000      
Subsequent cost capitalized [1] 14,787,000      
Gross carrying amount of Land 2,996,000      
Gross carrying amount of building and improvements 25,291,000      
SEC Schedule III, Real Estate, Gross, Total 28,287,000      
Accumulated Depreciation 9,288,000      
Amount of Encumbrance $ 27,840,000      
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 Suffolk Downs [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2005      
Percent Owned 100.00%      
Gross Leasable Area | property 121,320      
Initial cost to the Company, Land $ 7,580,000      
Initial cost to the Company, Building and Improvements 11,089,000      
Subsequent cost capitalized [1] 9,569,000      
Gross carrying amount of Land 7,580,000      
Gross carrying amount of building and improvements 20,658,000      
SEC Schedule III, Real Estate, Gross, Total 28,238,000      
Accumulated Depreciation $ 5,530,000      
The Shops at Suffolk Downs [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2005      
The 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 183,775      
Initial cost to the Company, Land $ 3,412,000      
Initial cost to the Company, Building and Improvements 19,240,000      
Subsequent cost capitalized [1] 593,000      
Gross carrying amount of Land 3,368,000      
Gross carrying amount of building and improvements 19,877,000      
SEC Schedule III, Real Estate, Gross, Total 23,245,000      
Accumulated Depreciation $ 4,615,000      
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 337,297      
Initial cost to the Company, Land $ 6,932,000      
Initial cost to the Company, Building and Improvements 32,815,000      
Subsequent cost capitalized [1] 7,588,000      
Gross carrying amount of Land 6,932,000      
Gross carrying amount of building and improvements 40,403,000      
SEC Schedule III, Real Estate, Gross, Total 47,335,000      
Accumulated Depreciation $ 12,052,000      
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 321,129      
Initial cost to the Company, Land $ 13,349,000      
Initial cost to the Company, Building and Improvements 23,867,000      
Subsequent cost capitalized [1] 26,578,000      
Gross carrying amount of Land 13,351,000      
Gross carrying amount of building and improvements 50,443,000      
SEC Schedule III, Real Estate, Gross, Total 63,794,000      
Accumulated Depreciation $ 8,761,000      
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] 1,354,000      
Gross carrying amount of Land 1,950,000      
Gross carrying amount of building and improvements 9,120,000      
SEC Schedule III, Real Estate, Gross, Total 11,070,000      
Accumulated Depreciation $ 3,292,000      
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 Center Shoppes [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2001      
Percent Owned 100.00%      
Gross Leasable Area | property 157,394      
Initial cost to the Company, Land $ 2,061,000      
Initial cost to the Company, Building and Improvements 7,314,000      
Subsequent cost capitalized [1] 4,460,000      
Gross carrying amount of Land 2,000,000      
Gross carrying amount of building and improvements 11,835,000      
SEC Schedule III, Real Estate, Gross, Total 13,835,000      
Accumulated Depreciation $ 4,821,000      
Washington Center Shoppes [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1979      
Washington Center 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] 2,847,000      
Gross carrying amount of Land 4,082,000      
Gross carrying amount of building and improvements 20,728,000      
SEC Schedule III, Real Estate, Gross, Total 24,810,000      
Accumulated Depreciation $ 4,727,000      
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      
West Bridgewater Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 133,039      
Initial cost to the Company, Land $ 2,823,000      
Initial cost to the Company, Building and Improvements 14,901,000      
Subsequent cost capitalized [1] (685,000)      
Gross carrying amount of Land 2,596,000      
Gross carrying amount of building and improvements 14,443,000      
SEC Schedule III, Real Estate, Gross, Total 17,039,000      
Accumulated Depreciation $ 4,127,000      
West Bridgewater Plaza [Member] | Minimum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 1970      
West Bridgewater Plaza [Member] | Maximum [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year built/Year last renovated 2007      
Yorktowne Plaza [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Year acquired 2007      
Percent Owned 100.00%      
Gross Leasable Area | property 158,982      
Initial cost to the Company, Land $ 5,940,000      
Initial cost to the Company, Building and Improvements 25,505,000      
Subsequent cost capitalized [1] 463,000      
Gross carrying amount of Land 5,798,000      
Gross carrying amount of building and improvements 26,110,000      
SEC Schedule III, Real Estate, Gross, Total 31,908,000      
Accumulated Depreciation $ 7,881,000      
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      
Land Parcels [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] (1,084,000)      
Gross carrying amount of Land 881,000      
SEC Schedule III, Real Estate, Gross, Total $ 881,000      
[1] Negative amounts represent write-offs of fully depreciated assets.
[2] At December 31, 2016, the aggregate cost for federal income tax purposes was approximately $26.5 million greater than the Company's recorded values.