Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Royce Capital Fund - Micro-Cap Portfolio | Royce Capital Fund - Micro-Cap Portfolio - Investment Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 13.90% | 13.70% | 18.80% | (22.40%) | 30.00% | 23.80% | 19.60% | (9.00%) | 5.20% | 19.70% |
| Royce Capital Fund - Small-Cap Portfolio | Royce Capital Fund - Small-Cap Portfolio - Investment Class | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 8.90% | 3.40% | 25.90% | (9.20%) | 28.80% | (7.20%) | 18.70% | (8.30%) | 5.40% | 21.00% |