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Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2023
USD ($)
Property
Jun. 30, 2022
USD ($)
Concentration Risk [Line Items]    
Number of Properties | Property 16  
Gross Real Estate Assets $ 392,000  
Geographic Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 16  
Gross Real Estate Assets $ 392,010  
Percentage of Total Real Estate Assets 100.00%  
Geographic Concentration Risk [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 20,465 $ 13,665
Geographic Concentration Risk [Member] | Maryland [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 6  
Gross Real Estate Assets $ 101,203  
Percentage of Total Real Estate Assets 25.80%  
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 6,078 6,061
Geographic Concentration Risk [Member] | Virginia [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 5  
Gross Real Estate Assets $ 197,208  
Percentage of Total Real Estate Assets 50.30%  
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 8,703 3,636
Geographic Concentration Risk [Member] | Pennsylvania [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property [1] 1  
Gross Real Estate Assets [1] $ 20,923  
Percentage of Total Real Estate Assets [1] 5.30%  
Geographic Concentration Risk [Member] | Pennsylvania [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues [1] $ 1,353 1,058
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 $ 303 306
Geographic Concentration Risk [Member] | Colorado [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 3  
Gross Real Estate Assets $ 64,254  
Percentage of Total Real Estate Assets 16.40%  
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 4,028 $ 2,604
[1] Represents Dekalb Plaza, which was sold on July 20, 2023.