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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 16, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
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    
ICFR Auditor Attestation Flag false    
Entity Common Stock, Shares Outstanding   9,356,202  
Entity Public Float     $ 33,524,029
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 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K.