| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 8, 2021 | Sep 3, 2021 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 5, 2020 | Oct 1, 2020 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 1, 2019 | Oct 1, 2019 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2018 | Dec 7, 2018 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 7, 2018 | Nov 6, 2018 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 10, 2018 | Sep 7, 2018 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 26, 2018 | Apr 24, 2018 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 20, 2018 | Feb 16, 2018 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 8, 2017 | Nov 7, 2017 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 16, 2017 | May 15, 2017 | 000-20167 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2017 | Feb 9, 2017 | 000-20167 |