| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | Mar 9, 2022 | Mar 7, 2022 | 001-12882 |
| 4/A | Open Document | Open Filing | AMENDED STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | May 21, 2021 | May 6, 2021 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 10, 2021 | May 6, 2021 | 001-12882 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Sep 17, 2020 | Sep 15, 2020 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 15, 2019 | Apr 11, 2019 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 16, 2018 | Apr 12, 2018 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2017 | Apr 13, 2017 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 18, 2016 | Apr 14, 2016 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2015 | Apr 16, 2015 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 6, 2015 | Mar 4, 2015 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 7, 2014 | Nov 5, 2014 | 001-12882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 28, 2014 | Apr 24, 2014 | 001-12882 |