Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.19.3
Document And Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol SELF  
Entity Registrant Name Global Self Storage, Inc.  
Entity Central Index Key 0001031235  
Current Fiscal Year End Date --12-31  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Common Stock, Shares Outstanding   7,729,006
Entity Shell Company false  
Entity File Number 001-12681  
Entity Tax Identification Number 13-3926714  
Entity Address, Address Line One 11 Hanover Square  
Entity Address, Address Line Two 12th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10005  
City Area Code 212  
Local Phone Number 785-0900  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code MD  
Document Quarterly Report true  
Document Transition Report false  
Title of 12(b) Security Common shares, $0.01 par value per share  
Security Exchange Name NASDAQ