| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2021 | May 19, 2021 | 000-21121 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 8, 2021 | Mar 4, 2021 | 000-21121 |
| 4 | Open Document | Open Filing | FORM 4 | May 4, 2020 | Apr 30, 2020 | 000-21121 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 2, 2020 | Feb 27, 2020 | 000-21121 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 6, 2019 | Feb 27, 2019 | 000-21121 |