| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Sep 9, 2021 | Sep 7, 2021 | 001-08519 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 28, 2020 | Sep 24, 2020 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2019 | May 2, 2019 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2018 | May 1, 2018 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2017 | May 2, 2017 | 001-08519 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2016 | Apr 29, 2016 | 001-08519 |
| 4 | Open Document | Open Filing | Aug 26, 2015 | Aug 24, 2015 | 001-07323 | |
| SC 13D/A | Open Document | Open Filing | FORM SC 13D/A | Aug 25, 2015 | ||
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2015 | Apr 30, 2015 | 001-08519 |
| 4 | Open Document | Open Filing | Oct 24, 2014 | Oct 22, 2014 | 001-07323 | |
| 4 | Open Document | Open Filing | FORM 4 | Aug 6, 2014 | Aug 4, 2014 | 001-07323 |
| 4/A | Open Document | Open Filing | FORM 4/A | Jun 20, 2014 | Oct 2, 2013 | 001-07323 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 9, 2014 | May 6, 2014 | 001-08519 |