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Note 4 - Real Estate Assets - Summary of Properties Owned (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Real estate assets owned $ 166,254 $ 200,207
Garden Gateway Plaza [Member]    
Geographic location [1] Colorado Springs, Colorado  
Real estate assets owned [1] $ 11,465 11,428
World Plaza [Member]    
Geographic location [1] San Bernardino, California  
Real estate assets owned [1] $ 9,272 8,305
Executive Office Park [Member]    
Geographic location [2] Colorado Springs, Colorado  
Real estate assets owned [2] $ 5,106 7,723
Waterman Plaza [Member]    
Geographic location [1] San Bernardino, California  
Real estate assets owned [1] $ 3,500 4,889
Genesis Plaza [Member]    
Geographic location San Diego, California  
Real estate assets owned $ 8,651 8,789
Dakota Center [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 8,597 8,855
Grand Pacific Center [Member]    
Geographic location Bismarck, North Dakota  
Real estate assets owned $ 5,684 5,914
Union Terrace [Member]    
Geographic location [3] Lakewood, CO  
Real estate assets owned [3] $ 0 8,425
Centennial Tech Center [Member]    
Geographic location [3] Colorado Springs, Colorado  
Real estate assets owned [3] $ 0 13,132
Arapahoe Center [Member]    
Geographic location Centennial, Colorado  
Real estate assets owned $ 9,233 9,748
Union Town Center [Member]    
Geographic location Colorado Springs, Colorado  
Real estate assets owned $ 9,345 9,612
West Fargo Industrial [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 7,061 7,212
The 300 N.P [Member]    
Geographic location Fargo, North Dakota  
Real estate assets owned $ 3,280 3,405
Research Parkway [Member]    
Geographic location Colorado Springs, Colorado  
Real estate assets owned $ 2,438 2,512
One Park Centre [Member]    
Geographic location Westminster, Colorado  
Real estate assets owned $ 8,586 8,518
Highland Court [Member]    
Geographic location [1] Centennial, Colorado  
Real estate assets owned [1] $ 10,500 11,421
Shea Center II [Member]    
Geographic location Highlands Ranch, Colorado  
Real estate assets owned $ 21,026 21,853
Presidio Property Trust, Inc. Properties [Member]    
Real estate assets owned 123,744 151,741
Model Home Properties [Member]    
Real estate assets owned [4] $ 42,510 $ 48,466
[1] Property held for sale as of December 31, 2020.
[2] One of four buildings within this property was sold as of December 31, 2020.
[3] This property was sold during the year ended December 31, 2020.
[4] Includes seven Model Homes that are listed as held for sale as of December 31, 2020.