| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 13, 2025 | Aug 11, 2025 | 000-28542 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 4, 2019 | May 31, 2019 | 000-28542 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 10, 2018 | Apr 4, 2018 | 000-28542 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 6, 2016 | Dec 6, 2016 | 000-28542 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 29, 2015 | Dec 24, 2015 | 000-28542 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 7, 2015 | Dec 4, 2015 | 000-23776 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 2, 2015 | Sep 1, 2015 | 000-23776 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2015 | May 19, 2015 | 000-23776 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 9, 2015 | Feb 9, 2015 | 000-23776 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2014 | Jun 4, 2014 | 000-23776 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2014 | May 19, 2014 | 000-23776 |