| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Jun 2021 | 09 Jun 2021 | 001-12648 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Jun 2020 | 10 Jun 2020 | 001-12648 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Jun 2019 | 05 Jun 2019 | 001-12648 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Aug 2018 | 03 Aug 2018 | 000-21433 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 03 Aug 2018 | 01 Aug 2018 | 000-21433 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Jun 2018 | 06 Jun 2018 | 001-12648 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 07 Aug 2017 | 03 Aug 2017 | 000-21433 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 03 Aug 2017 | 01 Aug 2017 | 000-21433 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | 03 Aug 2017 | 03 Aug 2016 | 000-21433 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | 03 Aug 2017 | 01 Aug 2016 | 000-21433 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 08 Jun 2017 | 06 Jun 2017 | 001-12648 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 04 Aug 2016 | 03 Aug 2016 | 000-21433 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 03 Aug 2016 | 01 Aug 2016 | 000-21433 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Jun 2016 | 09 Jun 2016 | 001-12648 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 04 Aug 2015 | 03 Aug 2015 | 000-21433 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Jun 2015 | 10 Jun 2015 | 001-12648 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 05 Aug 2014 | 01 Aug 2014 | 000-21433 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Jun 2014 | 11 Jun 2014 | 001-12648 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Mar 2014 | 12 Mar 2014 | 001-12648 |