| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 9, 2021 | Jun 25, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 29, 2021 | Jun 25, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 6, 2021 | Apr 5, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 9, 2021 | Mar 5, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 4, 2021 | Mar 1, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 26, 2021 | Feb 24, 2021 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 15, 2020 | Apr 21, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 23, 2020 | Nov 20, 2020 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 7, 2020 | Apr 6, 2020 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 26, 2020 | Feb 24, 2020 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 21, 2020 | Feb 19, 2020 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 8, 2019 | Apr 5, 2019 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 1, 2019 | Feb 28, 2019 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 21, 2019 | Feb 19, 2019 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 5, 2019 | Feb 4, 2019 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 5, 2018 | Mar 1, 2018 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 21, 2018 | Feb 19, 2018 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 7, 2018 | Feb 5, 2018 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2017 | Mar 1, 2017 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 6, 2017 | Feb 2, 2017 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 20, 2016 | Jun 17, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 15, 2016 | Mar 11, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2016 | Mar 1, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 16, 2016 | Feb 11, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 4, 2016 | Feb 2, 2016 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 18, 2015 | Jun 17, 2015 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 23, 2015 | Mar 20, 2015 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2015 | Feb 11, 2015 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 9, 2015 | Feb 5, 2015 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 4, 2015 | Feb 2, 2015 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 30, 2014 | Jun 27, 2014 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 19, 2014 | Jun 17, 2014 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2014 | May 19, 2014 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 11, 2014 | Mar 9, 2014 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2014 | Feb 11, 2014 | 000-26076 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 7, 2014 | Feb 5, 2014 | 000-26076 |