| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Jul 23, 2021 | Jul 21, 2021 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 24, 2021 | May 20, 2021 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 18, 2020 | May 14, 2020 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 17, 2019 | May 15, 2019 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 11, 2018 | May 9, 2018 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 12, 2017 | May 10, 2017 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 13, 2016 | May 11, 2016 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 8, 2015 | May 6, 2015 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 27, 2014 | Aug 25, 2014 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | May 7, 2014 | May 5, 2014 | 000-27756 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 4, 2014 | Feb 28, 2014 | 000-27756 |