| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 27, 2025 | May 22, 2025 | 000-27688 |
| 4 | Open Document | Open Filing | Apr 14, 2025 | Apr 10, 2025 | 000-27688 | |
| 4 | Open Document | Open Filing | Jun 12, 2023 | Apr 17, 2023 | 000-27688 | |
| 4 | Open Document | Open Filing | Mar 11, 2022 | Mar 7, 2022 | 000-27688 | |
| 4 | Open Document | Open Filing | May 10, 2021 | May 10, 2021 | 000-27688 | |
| 4 | Open Document | Open Filing | May 27, 2020 | Apr 29, 2020 | 000-27688 | |
| 4 | Open Document | Open Filing | May 17, 2019 | May 15, 2019 | 000-27688 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 5, 2016 | Oct 3, 2016 | 000-27688 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 3, 2016 | Sep 29, 2016 | 000-27688 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 26, 2016 | May 25, 2016 | 000-27688 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 7, 2015 | May 5, 2015 | 000-27688 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 23, 2015 | Apr 23, 2015 | 000-27688 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 18, 2014 | Apr 10, 2014 | 000-27688 |