Note 12 - Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) Property	Dec. 31, 2022 USD ($) Property
Concentration Risk [Line Items]
Number of Properties | Property		15
Total Gross Real Estate Assets		$ 373,935
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties | Property		15	17
Total Gross Real Estate Assets		$ 373,935	$ 410,102
Percentage of Total Gross Real Estate Assets		100.00%	100.00%
Geographic Concentration Risk [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 38,990	$ 29,871
Geographic Concentration Risk [Member] | Maryland [Member]
Concentration Risk [Line Items]
Number of Properties | Property		6	6
Total Gross Real Estate Assets		$ 102,723	$ 100,335
Percentage of Total Gross Real Estate Assets		27.50%	24.50%
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 12,486	$ 12,896
Geographic Concentration Risk [Member] | Virginia [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[1]	5	6
Total Gross Real Estate Assets	[1]	$ 198,680	$ 210,641
Percentage of Total Gross Real Estate Assets	[1]	53.10%	51.40%
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[1]	$ 16,243	$ 8,614
Geographic Concentration Risk [Member] | Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[2]	0	1
Total Gross Real Estate Assets	[2]	$ 0	$ 27,201
Percentage of Total Gross Real Estate Assets	[2]	0.00%	6.60%
Geographic Concentration Risk [Member] | Pennsylvania [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[2]	$ 1,501	$ 2,325
Geographic Concentration Risk [Member] | Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties | Property		1	1
Total Gross Real Estate Assets		$ 8,422	$ 8,422
Percentage of Total Gross Real Estate Assets		2.30%	2.00%
Geographic Concentration Risk [Member] | Washington, D.C. [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 594	$ 706
Geographic Concentration Risk [Member] | Colorado [Member]
Concentration Risk [Line Items]
Number of Properties | Property		3	3
Total Gross Real Estate Assets		$ 64,110	$ 63,503
Percentage of Total Gross Real Estate Assets		17.10%	15.50%
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 8,166	$ 5,330

[1] Rental income includes Spotswood Valley Square Shopping Center, which was sold on June 30, 2023 and had rental income of $1.2 million and $2.4 million for the years ended December 31, 2023 and 2022, respectively.

[2] Rental income related solely to Dekalb Plaza, which was sold on July 20, 2023.