Schedule III - Real Estate and Accumulated Depreciation - Summary of Properties (Details)	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	2,832,129
Land	$ 74,960,000
Building and Improvements	302,680,000
Subsequent cost capitalized	(9,475,000)
Land	69,085,000
Building and improvements	299,080,000
Total	368,165,000	$ 364,110,000	$ 369,827,000
Accumulated depreciation	$ 166,489,000	$ 157,468,000	$ 155,250,000
Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Brickyard Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	227,598
Land	$ 7,632,000
Building and Improvements	29,308,000
Subsequent cost capitalized	(812,000)
Land	7,648,000
Building and improvements	28,480,000
Total	36,128,000
Accumulated depreciation	$ 14,894,000
Brickyard Plaza | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Brickyard Plaza | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Carll's Corner
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	116,532
Land	$ 3,034,000
Building and Improvements	15,293,000
Subsequent cost capitalized	(12,541,000)
Land	220,000
Building and improvements	5,566,000
Total	5,786,000
Accumulated depreciation	$ 4,756,000
Carll's Corner | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Carll's Corner | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Coliseum Marketplace
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	106,648
Land	$ 2,924,000
Building and Improvements	14,416,000
Subsequent cost capitalized	(2,936,000)
Land	3,586,000
Building and improvements	10,818,000
Total	14,404,000
Accumulated depreciation	$ 7,182,000
Coliseum Marketplace | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Coliseum Marketplace | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Fairview Commons
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	50,119
Land	$ 858,000
Building and Improvements	3,568,000
Subsequent cost capitalized	462,000
Land	858,000
Building and improvements	4,030,000
Total	4,888,000
Accumulated depreciation	$ 1,964,000
Fairview Commons | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Fairview Commons | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Fieldstone Marketplace
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	193,970
Land	$ 5,229,000
Building and Improvements	21,440,000
Subsequent cost capitalized	(3,206,000)
Land	5,167,000
Building and improvements	18,296,000
Total	23,463,000
Accumulated depreciation	$ 12,593,000
Fieldstone Marketplace | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Fieldstone Marketplace | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Gold Star Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	71,720
Land	$ 1,644,000
Building and Improvements	6,519,000
Subsequent cost capitalized	(115,000)
Land	1,644,000
Building and improvements	6,404,000
Total	8,048,000
Accumulated depreciation	$ 3,018,000
Gold Star Plaza | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Gold Star Plaza | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Golden Triangle
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	202,790
Land	$ 2,320,000
Building and Improvements	9,713,000
Subsequent cost capitalized	12,162,000
Land	2,320,000
Building and improvements	21,875,000
Total	24,195,000
Accumulated depreciation	$ 12,063,000
Golden Triangle | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Golden Triangle | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Hamburg Square
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	102,058
Land	$ 1,153,000
Building and Improvements	4,678,000
Subsequent cost capitalized	6,571,000
Land	1,153,000
Building and improvements	11,249,000
Total	12,402,000
Accumulated depreciation	$ 5,263,000
Hamburg Square | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Hamburg Square | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Kings Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	168,243
Land	$ 2,413,000
Building and Improvements	12,604,000
Subsequent cost capitalized	2,611,000
Land	2,408,000
Building and improvements	15,220,000
Total	17,628,000
Accumulated depreciation	$ 5,970,000
Kings Plaza | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Kings Plaza | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Oakland Commons
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	90,100
Land	$ 2,504,000
Building and Improvements	15,662,000
Subsequent cost capitalized	(4,668,000)
Land	2,504,000
Building and improvements	10,994,000
Total	13,498,000
Accumulated depreciation	$ 6,654,000
Oakland Commons | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Oakland Commons | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Oregon Avenue
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	0
Land	$ 2,247,000
Building and Improvements	18,616,000
Subsequent cost capitalized	(16,969,000)
Land	2,141,000
Building and improvements	1,753,000
Total	3,894,000
Accumulated depreciation	$ 177,000
Oregon Avenue | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Oregon Avenue | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Patuxent Crossing
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	264,068
Land	$ 14,849,000
Building and Improvements	18,445,000
Subsequent cost capitalized	1,916,000
Land	13,211,000
Building and improvements	21,999,000
Total	35,210,000
Accumulated depreciation	$ 11,563,000
Patuxent Crossing | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Patuxent Crossing | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Pine Grove Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	79,306
Land	$ 2,010,000
Building and Improvements	6,489,000
Subsequent cost capitalized	652,000
Land	1,622,000
Building and improvements	7,529,000
Total	9,151,000
Accumulated depreciation	$ 4,062,000
Pine Grove Plaza | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Pine Grove Plaza | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
South Philadelphia
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	221,511
Land	$ 8,222,000
Building and Improvements	36,314,000
Subsequent cost capitalized	(8,670,000)
Land	8,222,000
Building and improvements	27,644,000
Total	35,866,000
Accumulated depreciation	$ 22,627,000
South Philadelphia | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
South Philadelphia | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Southington Center
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	155,842
Land	$ 0
Building and Improvements	11,834,000
Subsequent cost capitalized	1,464,000
Land	0
Building and improvements	13,298,000
Total	13,298,000
Accumulated depreciation	$ 6,591,000
Southington Center | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Southington Center | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Timpany Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 9,060,000
Gross leasable area | ft²	182,799
Land	$ 3,412,000
Building and Improvements	19,240,000
Subsequent cost capitalized	(3,801,000)
Land	3,368,000
Building and improvements	15,483,000
Total	18,851,000
Accumulated depreciation	$ 8,349,000
Timpany Plaza | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Timpany Plaza | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Trexler Mall
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	342,541
Land	$ 6,932,000
Building and Improvements	32,815,000
Subsequent cost capitalized	13,705,000
Land	6,932,000
Building and improvements	46,520,000
Total	53,452,000
Accumulated depreciation	$ 21,946,000
Trexler Mall | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Trexler Mall | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Washington Centers Shoppes
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	157,300
Land	$ 2,061,000
Building and Improvements	7,314,000
Subsequent cost capitalized	7,617,000
Land	2,000,000
Building and improvements	14,992,000
Total	16,992,000
Accumulated depreciation	$ 7,719,000
Washington Centers Shoppes | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Washington Centers Shoppes | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Webster Commons
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	98,984
Land	$ 3,551,000
Building and Improvements	18,412,000
Subsequent cost capitalized	(1,518,000)
Land	4,081,000
Building and improvements	16,364,000
Total	20,445,000
Accumulated depreciation	$ 8,892,000
Webster Commons | Minimum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	3 years
Webster Commons | Maximum
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Real estate investments useful life (in years)	40 years
Other
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Gross leasable area | ft²	0
Land	$ 1,965,000
Building and Improvements	0
Subsequent cost capitalized	(1,399,000)
Land	0
Building and improvements	566,000
Total	566,000
Accumulated depreciation	$ 206,000