Document And Entity Information - shares |
9 Months Ended | |
|---|---|---|
Sep. 30, 2017 |
Oct. 31, 2017 |
|
| Document And Entity Information [Abstract] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Sep. 30, 2017 | |
| Document Fiscal Year Focus | 2017 | |
| 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 Filer Category | Smaller Reporting Company | |
| Entity Common Stock, Shares Outstanding | 7,619,469 |