| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2021 | May 14, 2021 | 001-07109 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 14, 2020 | Aug 12, 2020 | 001-07109 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 27, 2019 | Aug 23, 2019 | 001-07109 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 30, 2019 | Apr 26, 2019 | 001-07109 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 15, 2018 | Aug 13, 2018 | 001-07109 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2017 | May 12, 2017 | 001-07109 |