| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 28, 2022 | Apr 26, 2022 | 001-02979 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 29, 2021 | Apr 27, 2021 | 001-02979 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 30, 2020 | Apr 28, 2020 | 001-02979 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 25, 2019 | Apr 23, 2019 | 001-02979 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 26, 2018 | Apr 24, 2018 | 001-02979 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 5, 2017 | Sep 1, 2017 | 001-02979 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 5, 2017 | Sep 1, 2017 | 001-02979 |