| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 1, 2021 | Sep 1, 2021 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2021 | Feb 1, 2021 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 26, 2021 | Jan 22, 2021 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 6, 2021 | Jan 1, 2021 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 24, 2020 | Jan 22, 2020 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 6, 2020 | Jan 2, 2019 | 000-51515 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 19, 2019 | Jan 23, 2019 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 25, 2019 | Jan 23, 2019 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 24, 2019 | Jan 22, 2019 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 3, 2019 | Jan 1, 2019 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 8, 2018 | Nov 8, 2018 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 29, 2018 | May 16, 2018 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 24, 2018 | Jan 22, 2018 | 000-51515 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 12, 2018 | Jan 1, 2018 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 3, 2018 | Jan 1, 2018 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 25, 2017 | Jan 20, 2017 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 11, 2017 | Jan 1, 2017 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2016 | May 13, 2016 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2016 | Jan 20, 2016 | 000-51515 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2016 | Jan 21, 2016 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 27, 2016 | Jan 21, 2016 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 8, 2016 | Jan 1, 2016 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 12, 2015 | 000-51515 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 20, 2015 | May 13, 2013 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 5, 2015 | Feb 3, 2015 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2015 | Jan 21, 2015 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 23, 2015 | Jan 21, 2015 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 6, 2015 | Jan 2, 2015 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 5, 2015 | Dec 31, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 2, 2014 | Sep 30, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 2, 2014 | Jun 30, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 2, 2014 | Mar 31, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2014 | Feb 3, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 7, 2014 | Feb 5, 2014 | 000-51515 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 3, 2014 | Dec 31, 2013 | 000-51515 |