Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Details) $ in Thousands		6 Months Ended
		Jun. 30, 2024 USD ($) Property	Jun. 30, 2023 USD ($)
Concentration Risk [Line Items]
Number of Properties | Property		15
Gross Real Estate Assets		$ 374,400
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties | Property		15
Gross Real Estate Assets		$ 374,367
Percentage of Total Real Estate Assets		100.00%
Geographic Concentration Risk [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 18,766	$ 20,465
Geographic Concentration Risk [Member] | Maryland [Member]
Concentration Risk [Line Items]
Number of Properties | Property		6
Gross Real Estate Assets		$ 102,264
Percentage of Total Real Estate Assets		27.30%
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 6,425	6,078
Geographic Concentration Risk [Member] | Virginia [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[1]	5
Gross Real Estate Assets	[1]	$ 198,573
Percentage of Total Real Estate Assets	[1]	53.10%
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[1]	$ 7,781	8,703
Geographic Concentration Risk [Member] | Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[2]	0
Gross Real Estate Assets	[2]	$ 0
Percentage of Total Real Estate Assets	[2]	0.00%
Geographic Concentration Risk [Member] | Pennsylvania [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[2]	$ 0	1,353
Geographic Concentration Risk [Member] | Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties | Property		1
Gross Real Estate Assets		$ 8,380
Percentage of Total Real Estate Assets		2.20%
Geographic Concentration Risk [Member] | Washington, D.C. [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 400	303
Geographic Concentration Risk [Member] | Colorado [Member]
Concentration Risk [Line Items]
Number of Properties | Property		3
Gross Real Estate Assets		$ 65,150
Percentage of Total Real Estate Assets		17.40%
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 4,160	$ 4,028

[1] Rental income for the six months ended June 30, 2023 includes $1.2 million of rental income from Spotswood Valley Square Shopping Center, which was sold on June 30, 2023.

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