| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 1, 2021 | Jun 30, 2021 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 21, 2020 | Apr 21, 2020 | 000-55394 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 28, 2019 | May 28, 2019 | 000-55394 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Apr 28, 2016 | Apr 26, 2016 | 001-14045 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 18, 2016 | Mar 18, 2016 | 001-14045 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 2, 2016 | Feb 29, 2016 | 001-14045 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jan 5, 2016 | Jan 1, 2016 | 001-14045 |
| 4 | Open Document | Open Filing | Mar 20, 2015 | Mar 19, 2015 | 001-14045 | |
| 4 | Open Document | Open Filing | Jan 5, 2015 | Jan 1, 2015 | 001-14045 | |
| 4 | Open Document | Open Filing | Jul 28, 2014 | Jul 28, 2014 | 001-14045 | |
| 4 | Open Document | Open Filing | Mar 21, 2014 | Mar 20, 2014 | 001-14045 | |
| 4 | Open Document | Open Filing | Jan 3, 2014 | Jan 1, 2014 | 001-14045 |