Organization	12 Months Ended
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1. ORGANIZATION Global Self Storage, Inc. (the “Company”) is a self-administered and self-managed REIT that owns, operates, manages, acquires, develops and redevelops self storage properties (“stores” or “properties”) in the United States. Our stores are designed to offer affordable, easily accessible, and secure storage space for residential and commercial customers. The Company currently owns and operates, through its wholly owned subsidiaries, eleven stores located in Connecticut, Illinois, Indiana, New York, Ohio, Pennsylvania, and South Carolina. The Company was formerly registered under the Investment Company Act of 1940, as amended (the “1940 Act”) as a non-diversified, closed end management investment company. The Securities and Exchange Commission’s (“SEC”) order approving the Company’s application to deregister from the 1940 Act was granted on January 19, 2016. Accordingly, effective January 19, 2016, the Company changed its name to Global Self Storage, Inc. from Self Storage Group, Inc., changed its SEC registration to an operating company reporting under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), from an investment company under the 1940 Act, and listed its common stock on the Nasdaq Capital Market (“NASDAQ”) under the symbol “SELF”. The Company has elected to be treated as a REIT under the Internal Revenue Code of 1986, as amended (the “IRC”). To the extent the Company continues to qualify as a REIT, it will not generally be subject to U.S. federal income tax, with certain limited exceptions, on its taxable income that is distributed to its stockholders. The Company invests in self storage properties by acquiring stores through its wholly owned subsidiaries. At December 31, 2018, the Company owned and operated 11 stores. The Company operates primarily in one segment: rental operations. Disclosure of the square footage of the self storage properties is unaudited and outside the scope of our independent registered public accounting firm’s audit of our financial statements in accordance with the standards of the Public Company Accounting Oversight Board (U.S.).

Organization

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. ORGANIZATION

Global Self Storage, Inc. (the “Company”) is a self-administered and self-managed REIT that owns, operates, manages, acquires, develops and redevelops self storage properties (“stores” or “properties”) in the United States. Our stores are designed to offer affordable, easily accessible, and secure storage space for residential and commercial customers. The Company currently owns and operates, through its wholly owned subsidiaries, eleven stores located in Connecticut, Illinois, Indiana, New York, Ohio, Pennsylvania, and South Carolina. The Company was formerly registered under the Investment Company Act of 1940, as amended (the “1940 Act”) as a non-diversified, closed end management investment company. The Securities and Exchange Commission’s (“SEC”) order approving the Company’s application to deregister from the 1940 Act was granted on January 19, 2016. Accordingly, effective January 19, 2016, the Company changed its name to Global Self Storage, Inc. from Self Storage Group, Inc., changed its SEC registration to an operating company reporting under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), from an investment company under the 1940 Act, and listed its common stock on the Nasdaq Capital Market (“NASDAQ”) under the symbol “SELF”.

The Company has elected to be treated as a REIT under the Internal Revenue Code of 1986, as amended (the “IRC”). To the extent the Company continues to qualify as a REIT, it will not generally be subject to U.S. federal income tax, with certain limited exceptions, on its taxable income that is distributed to its stockholders.

The Company invests in self storage properties by acquiring stores through its wholly owned subsidiaries. At December 31, 2018, the Company owned and operated 11 stores. The Company operates primarily in one segment: rental operations.

Disclosure of the square footage of the self storage properties is unaudited and outside the scope of our independent registered public accounting firm’s audit of our financial statements in accordance with the standards of the Public Company Accounting Oversight Board (U.S.).