| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 16, 2021 | Jun 15, 2021 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2021 | May 14, 2021 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 8, 2020 | Dec 6, 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 23, 2020 | Nov 20, 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 5, 2020 | Oct 1, 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 25, 2020 | Sep 23, 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 20, 2020 | Feb 19, 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2019 | Dec 8, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 22, 2019 | Nov 20, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 3, 2019 | Oct 1, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 24, 2019 | Sep 20, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 8, 2019 | May 6, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 7, 2019 | May 3, 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 11, 2018 | Dec 9, 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 21, 2018 | Nov 20, 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 22, 2018 | Oct 19, 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 24, 2018 | Sep 20, 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 8, 2018 | May 6, 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 21, 2017 | Nov 20, 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 20, 2017 | Oct 19, 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2017 | Apr 30, 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 20, 2016 | Oct 19, 2016 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2016 | May 1, 2016 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 1, 2016 | Jan 29, 2016 | 000-19528 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 29, 2015 | Oct 19, 2015 | 000-19528 |