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Note 11 - Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Property
Dec. 31, 2021
USD ($)
Property
Concentration Risk [Line Items]    
Number of Properties | Property 17  
Total Gross Real Estate Assets $ 410,102  
Geographic Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 17 15
Total Gross Real Estate Assets $ 410,102 $ 257,917
Percentage of Total Gross Real Estate Assets 100.00% 100.00%
Geographic Concentration Risk [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 29,871 $ 21,408
Geographic Concentration Risk [Member] | Maryland [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 6 6
Total Gross Real Estate Assets $ 100,335 $ 101,608
Percentage of Total Gross Real Estate Assets 24.50% 39.40%
Geographic Concentration Risk [Member] | Maryland [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 12,896 $ 10,332
Geographic Concentration Risk [Member] | Virginia [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 6 5
Total Gross Real Estate Assets $ 210,641 $ 82,909
Percentage of Total Gross Real Estate Assets 51.40% 32.10%
Geographic Concentration Risk [Member] | Virginia [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 8,614 $ 6,418
Geographic Concentration Risk [Member] | Pennsylvania [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 1 1
Total Gross Real Estate Assets $ 27,201 $ 27,628
Percentage of Total Gross Real Estate Assets 6.60% 10.70%
Geographic Concentration Risk [Member] | Pennsylvania [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 2,325 $ 2,457
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 $ 8,393
Percentage of Total Gross Real Estate Assets 2.00% 3.30%
Geographic Concentration Risk [Member] | Washington, D.C. [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 706 $ 608
Geographic Concentration Risk [Member] | Colorado [Member]    
Concentration Risk [Line Items]    
Number of Properties | Property 3 2
Total Gross Real Estate Assets $ 63,503 $ 37,379
Percentage of Total Gross Real Estate Assets 15.50% 14.50%
Geographic Concentration Risk [Member] | Colorado [Member] | Rental Income [Member]    
Concentration Risk [Line Items]    
Revenues $ 5,330 $ 1,593