| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2023 | May 1, 2023 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 16, 2022 | Aug 16, 2022 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 8, 2022 | Jun 7, 2022 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2021 | Jun 1, 2021 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 3, 2020 | Jun 1, 2020 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 4, 2019 | May 31, 2019 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 8, 2018 | Jun 8, 2018 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2017 | Jun 1, 2017 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 6, 2016 | Jun 6, 2016 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2015 | Jun 1, 2015 | 000-51826 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 10, 2014 | Jun 6, 2014 | 000-51826 |