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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 16, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description On March 30, 2020, Global Self Storage, Inc. (“we”, “us”, “our”, or the “Company”) filed an Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (the “Original Form 10-K”). This Amendment No. 1 on Form 10-K/A (this “Amendment”) is being filed to correct the certifications of the Company’s Chief Executive Officer and Chief Financial Officer, which were filed as Exhibits 31.1 and 31.2, respectively, to the Original Form 10-K, to include certain required language with respect to internal control over financial reporting which was inadvertently omitted from the Original Form 10-K. There has been no change to (i) the financial statements included in Part II, Item 8 hereof from those included in Part II, Item 8 of the Original Form 10-K, nor (ii) Part II, Item 9 hereof from Part II, Item 9 of the Original Form 10-K. Except as described above, this Amendment does not modify or update the disclosures presented in the Original Form 10-K or in the previously filed exhibits to the Original Form 10-K in any way. This Amendment speaks as of the date of the Original Form 10-K and does not reflect events occurring after the filing of the Original Form 10-K. As such, this Amendment should be read in conjunction with the Original Form 10-K, as well as any other filings made by the Company with the Securities and Exchange Commission (the “SEC”) pursuant to Section 13(a) or 15(d) of the Exchange Act subsequent to the filing of the Original Form 10-K.    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol SELF    
Entity Registrant Name Global Self Storage, Inc.    
Entity Central Index Key 0001031235    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   9,330,297  
Entity Public Float     $ 26,953,819
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 Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement to be issued in connection with the registrant’s annual stockholders’ meeting to be held in 2020 are incorporated by reference into Part III of this Annual Report on Form 10-K.