| Cover | Jul. 11, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 11, 2023 |
| Entity File Number | 1-35156 |
| Entity Registrant Name | SURO CAPITAL CORP. |
| Entity Central Index Key | 0001509470 |
| Entity Tax Identification Number | 27-4443543 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 640 Fifth Avenue |
| 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 | 10019 |
| City Area Code | 212 |
| Local Phone Number | 931-6331 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock, par value $0.01 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | SSSS |
| Security Exchange Name | NASDAQ |
| 6.00% Notes due 2026 | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 6.00% Notes due 2026 |
| Trading Symbol | SSSSL |
| Security Exchange Name | NASDAQ |
