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Note 4 - Real Estate Assets - Summary of Properties Owned (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Real estate assets owned $ 145,348  
World Plaza [Member]    
Geographic location [1] San Bernardino, California  
Real estate assets owned [1] $ 9,272  
Executive Office Park [Member]    
Geographic location [1] Colorado Springs, Colorado  
Real estate assets owned [1] $ 5,116  
Genesis Plaza [Member]    
Geographic location San Diego, California  
Real estate assets owned $ 8,472  
Dakota Center [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 8,540  
Grand Pacific Center [Member]    
Geographic location Bismarck, North Dakota  
Real estate assets owned $ 5,615  
Arapahoe Center [Member]    
Geographic location Centennial, Colorado  
Real estate assets owned $ 9,077  
Union Town Center [Member]    
Geographic location Colorado Springs, Colorado  
Real estate assets owned $ 9,276  
West Fargo Industrial [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 7,013  
The 300 N.P [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 3,278  
Research Parkway [Member]    
Geographic location Colorado Springs, Colorado  
Real estate assets owned $ 2,423  
One Park Centre [Member]    
Geographic location Westminster, Colorado  
Real estate assets owned $ 8,444  
Highland Court [Member]    
Geographic location [1] Centennial, Colorado  
Real estate assets owned $ 10,218 [1] $ 10,500
Shea Center II [Member]    
Geographic location Highlands Ranch, Colorado  
Real estate assets owned $ 20,715  
Presidio Property Trust, Inc. Properties [Member]    
Real estate assets owned 107,459  
Model Home Properties [Member]    
Real estate assets owned [2] $ 37,889  
[1] This property is held for sale as of March 31, 2021.
[2] Includes 16 Model Home listed as held for sale as of March 31, 2021.