| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Sep 9, 2021 | Sep 7, 2021 | 001-08519 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 28, 2020 | Sep 24, 2020 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 28, 2019 | Aug 26, 2019 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 21, 2019 | Aug 20, 2019 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2019 | May 2, 2019 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2018 | May 1, 2018 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2017 | May 2, 2017 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2016 | Apr 29, 2016 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 31, 2015 | Jul 29, 2015 | 001-08519 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 13, 2015 | Jul 2, 2015 | 001-08519 |