| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 29, 2021 | Jun 27, 2021 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 1, 2020 | Nov 28, 2020 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 2, 2020 | Oct 30, 2020 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 24, 2020 | Feb 21, 2020 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 3, 2019 | Nov 30, 2019 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 31, 2019 | Oct 29, 2019 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2019 | May 17, 2019 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2019 | Feb 21, 2019 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 1, 2018 | Oct 30, 2018 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 22, 2018 | Feb 21, 2018 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 23, 2017 | Feb 21, 2017 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 28, 2016 | Oct 26, 2016 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 24, 2015 | Jul 22, 2015 | 001-10542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 24, 2014 | Jul 22, 2014 | 001-10542 |