| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 3, 2021 | Sep 1, 2021 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 2, 2021 | Jan 29, 2021 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 17, 2020 | Dec 15, 2020 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 14, 2020 | Dec 10, 2020 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Oct 1, 2020 | Sep 30, 2020 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 5, 2020 | Mar 3, 2020 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 17, 2019 | Dec 15, 2019 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 12, 2019 | Dec 10, 2019 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 12, 2019 | Nov 7, 2019 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 7, 2019 | Mar 5, 2019 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 17, 2018 | Dec 15, 2018 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 11, 2018 | Dec 10, 2018 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | May 17, 2018 | May 15, 2018 | 000-20728 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 9, 2017 | Nov 7, 2017 | 000-20728 |