| Cover | Sep. 02, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 02, 2022 |
| Entity File Number | 814-00754 |
| Entity Registrant Name | SLR Investment Corp. |
| Entity Central Index Key | 0001418076 |
| Entity Tax Identification Number | 26-1381340 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 500 Park Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | 212 |
| Local Phone Number | 993-1670 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | SLRC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
