| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 2, 2022 | Jun 1, 2022 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 19, 2022 | May 18, 2022 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 29, 2021 | Apr 27, 2021 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 15, 2020 | Dec 14, 2020 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 30, 2020 | Jul 28, 2020 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 23, 2020 | Jul 9, 2020 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 30, 2020 | Apr 28, 2020 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2019 | May 22, 2019 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 6, 2019 | Feb 4, 2019 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 25, 2018 | May 24, 2018 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2018 | May 2, 2018 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2018 | May 1, 2018 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2017 | May 2, 2017 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 25, 2016 | May 18, 2016 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2016 | May 3, 2016 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 30, 2015 | Apr 28, 2015 | 000-23877 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2014 | Feb 27, 2014 | 000-23877 |