| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 Mar 2022 | 15 Mar 2022 | 001-06887 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Feb 2021 | 19 Feb 2021 | 001-06887 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 25 Feb 2020 | 21 Feb 2020 | 001-06887 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Aug 2019 | 01 Aug 2019 | 001-06887 |