| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | May 2, 2023 | Jan 20, 2023 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2022 | Apr 29, 2022 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 6, 2021 | Apr 30, 2021 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2020 | Apr 30, 2020 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 19, 2020 | Mar 19, 2020 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2019 | Apr 30, 2019 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 16, 2019 | Apr 12, 2019 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2018 | Apr 30, 2018 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2017 | Apr 30, 2017 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 24, 2016 | Apr 30, 2016 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2015 | Apr 30, 2015 | 000-01678 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 28, 2014 | Apr 30, 2014 | 000-01678 |