| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Aug 4, 2021 | Aug 3, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | May 4, 2021 | May 3, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | May 5, 2020 | May 1, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | May 2, 2019 | May 1, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 24, 2018 | Sep 21, 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 5, 2018 | Sep 4, 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 3, 2018 | May 1, 2018 | 000-14939 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 3, 2018 | Aug 2, 2017 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 12, 2016 | Oct 10, 2016 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 2, 2016 | Aug 1, 2016 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 19, 2016 | Feb 17, 2016 | 001-12147 |
| 5 | Open Document | Open Filing | FORM 5 SUBMISSION | Feb 10, 2016 | Dec 31, 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 30, 2015 | Nov 25, 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 3, 2015 | Mar 3, 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 25, 2015 | Feb 24, 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 20, 2015 | Feb 18, 2015 | 001-12147 |
| 5 | Open Document | Open Filing | FORM 5 SUBMISSION | Feb 12, 2015 | Dec 31, 2014 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 21, 2014 | Feb 19, 2014 | 001-12147 |