| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 11, 2021 | May 9, 2021 | 001-14445 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 5, 2020 | May 14, 2020 | 001-14445 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | May 29, 2020 | May 14, 2020 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 18, 2020 | May 14, 2020 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2019 | May 17, 2019 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 15, 2019 | May 13, 2019 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 9, 2018 | May 7, 2018 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 10, 2017 | May 8, 2017 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 11, 2016 | May 9, 2016 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 13, 2015 | May 11, 2015 | 001-14445 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 14, 2014 | May 12, 2014 | 001-14445 |