| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | 23 Jul 2021 | 21 Jul 2021 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 24 May 2021 | 20 May 2021 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 18 May 2020 | 14 May 2020 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 17 May 2019 | 15 May 2019 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 11 May 2018 | 09 May 2018 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 12 May 2017 | 10 May 2017 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 13 May 2016 | 11 May 2016 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 08 May 2015 | 06 May 2015 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 24 Jul 2014 | 22 Jul 2014 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | 07 May 2014 | 05 May 2014 | 000-27756 |
| 3 | Open Document | Open Filing | FORM 3 | 25 Apr 2014 | 17 Apr 2014 | 000-27756 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Feb 2012 | 03 Feb 2012 | 001-09853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 06 Feb 2012 | 02 Feb 2012 | 001-09853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Feb 2012 | 01 Feb 2012 | 001-09853 |