Note 13 - Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2024 USD ($) Property	Dec. 31, 2023 USD ($) Property
Concentration Risk [Line Items]
Number of Properties | Property		15
Total Gross Real Estate Assets		$ 375,224
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties | Property		15	15
Total Gross Real Estate Assets		$ 375,224	$ 373,935
Percentage of Total Gross Real Estate Assets		100.00%	100.00%
Geographic Concentration Risk [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 38,810	$ 38,990
Geographic Concentration Risk [Member] | Maryland [Member]
Concentration Risk [Line Items]
Number of Properties | Property		6	6
Total Gross Real Estate Assets		$ 102,795	$ 102,723
Percentage of Total Gross Real Estate Assets		27.40%	27.50%
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 13,746	$ 12,486
Geographic Concentration Risk [Member] | Virginia [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[1]	5	5
Total Gross Real Estate Assets	[1]	$ 199,040	$ 198,680
Percentage of Total Gross Real Estate Assets	[1]	53.10%	53.10%
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[1]	$ 16,046	$ 16,243
Geographic Concentration Risk [Member] | Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties | Property	[2]	0	0
Total Gross Real Estate Assets	[2]	$ 0	$ 0
Percentage of Total Gross Real Estate Assets	[2]	0.00%	0.00%
Geographic Concentration Risk [Member] | Pennsylvania [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues	[2]	$ 0	$ 1,501
Geographic Concentration Risk [Member] | Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties | Property		1	1
Total Gross Real Estate Assets		$ 8,381	$ 8,422
Percentage of Total Gross Real Estate Assets		2.20%	2.30%
Geographic Concentration Risk [Member] | Washington, D.C. [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 787	$ 594
Geographic Concentration Risk [Member] | Colorado [Member]
Concentration Risk [Line Items]
Number of Properties | Property		3	3
Total Gross Real Estate Assets		$ 65,008	$ 64,110
Percentage of Total Gross Real Estate Assets		17.30%	17.10%
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]
Concentration Risk [Line Items]
Revenues		$ 8,231	$ 8,166

[1] Rental income for the year ended December 31, 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.