XML 16 R1.htm IDEA: XBRL DOCUMENT v3.19.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Mar. 22, 2019
May 30, 2018
Document And Entity Information [Abstract]      
Entity Registrant Name PRESIDIO PROPERTY TRUST, INC.    
Entity Central Index Key 0001080657    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company false    
Trading Symbol SQFT    
Entity Public Float     $ 0
Entity Common Stock Shares Outstanding   17,709,883  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018