| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2022 | Apr 13, 2022 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 5, 2022 | Apr 4, 2022 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 31, 2021 | Aug 27, 2021 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 14, 2021 | Apr 13, 2021 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 7, 2021 | Apr 5, 2021 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 18, 2021 | Feb 16, 2021 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 28, 2020 | Aug 27, 2020 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 7, 2020 | Apr 3, 2020 | 001-15957 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 19, 2020 | Feb 13, 2020 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 18, 2020 | Feb 13, 2020 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 16, 2019 | Apr 12, 2019 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 5, 2019 | Apr 3, 2019 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 15, 2019 | Feb 13, 2019 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 6, 2018 | Jun 4, 2018 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 16, 2018 | May 14, 2018 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 16, 2018 | Apr 12, 2018 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 16, 2018 | Feb 14, 2018 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 15, 2018 | Feb 13, 2018 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2017 | May 15, 2017 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 12, 2017 | Apr 10, 2017 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 8, 2016 | Jun 6, 2016 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 18, 2016 | May 16, 2016 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 13, 2016 | Apr 11, 2016 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 30, 2016 | Mar 28, 2016 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 22, 2015 | Dec 18, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 11, 2015 | Aug 11, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 10, 2015 | Jun 6, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 18, 2015 | May 14, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 14, 2015 | Apr 12, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 13, 2015 | Apr 9, 2015 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 10, 2014 | Jun 6, 2014 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 16, 2014 | May 14, 2014 | 001-15957 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | May 15, 2014 | Mar 31, 2014 | 001-15957 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 10, 2014 | Apr 9, 2014 | 001-15957 |