| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 17, 2021 | Dec 15, 2021 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 28, 2020 | Dec 23, 2020 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 18, 2020 | Dec 16, 2020 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 14, 2020 | Sep 10, 2020 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 10, 2020 | Sep 8, 2020 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 20, 2019 | Dec 18, 2019 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 3, 2019 | Aug 30, 2019 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2018 | Dec 6, 2018 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 11, 2018 | Sep 7, 2018 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 8, 2018 | Jan 4, 2018 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 29, 2017 | Dec 28, 2017 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 11, 2017 | Dec 8, 2017 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 6, 2017 | Dec 5, 2017 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 12, 2016 | Dec 9, 2016 | 001-08649 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 7, 2016 | Dec 5, 2016 | 001-08649 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 18, 2016 | Oct 12, 2016 | 001-08649 |