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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
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   11,146,179  
Entity Public Float     $ 52,290,789
Entity File Number 001-12681    
Entity Tax Identification Number 13-3926714    
Entity Address, Address Line One 3814 Route 44    
Entity Address, City or Town Millbrook    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 12545    
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

Portions of the registrant’s definitive proxy statement to be issued in connection with the registrant’s annual stockholders’ meeting to be held in 2024 are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Blue Bell, Pennsylvania, United States    
Document Financial Statement Error Correction [Flag] false