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Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Property
Mar. 31, 2023
USD ($)
Concentration Risk [Line Items]    
Number of Properties | Property 15  
Gross Real Estate Assets $ 374,800  
Geographic Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 15  
Gross Real Estate Assets $ 374,768  
Percentage of Total Real Estate Assets 100.00%  
Geographic Concentration Risk [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 9,511 $ 10,208
Geographic Concentration Risk [Member] | Maryland [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 6  
Gross Real Estate Assets $ 102,282  
Percentage of Total Real Estate Assets 27.30%  
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 3,074 3,150
Geographic Concentration Risk [Member] | Virginia [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property [1] 5  
Gross Real Estate Assets [1] $ 198,900  
Percentage of Total Real Estate Assets [1] 53.10%  
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues [1] $ 3,965 4,222
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] $ 0 683
Geographic Concentration Risk [Member] | Washington, D.C. [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 1  
Gross Real Estate Assets $ 8,422  
Percentage of Total Real Estate Assets 2.20%  
Geographic Concentration Risk [Member] | Washington, D.C. [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 183 182
Geographic Concentration Risk [Member] | Colorado [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 3  
Gross Real Estate Assets $ 65,164  
Percentage of Total Real Estate Assets 17.40%  
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 2,289 $ 1,971
[1] Rental income includes Spotswood Valley Square Shopping Center, which was sold on June 30, 2023 and had rental income of $0.6 million for the three months ended March 31, 2023.
[2] Rental income related solely to Dekalb Plaza, which was sold on July 20, 2023