| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2022 | May 19, 2022 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 11, 2022 | Apr 8, 2022 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 3, 2021 | Dec 1, 2021 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2021 | May 27, 2021 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 25, 2020 | Jun 25, 2020 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2020 | May 28, 2020 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 14, 2020 | Apr 13, 2020 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 27, 2019 | Jun 25, 2019 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2019 | May 21, 2019 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2018 | May 22, 2018 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 6, 2018 | Apr 6, 2018 | 000-10661 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2017 | May 19, 2016 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2017 | May 23, 2017 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2017 | May 19, 2017 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 27, 2016 | Dec 22, 2016 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 15, 2016 | Dec 13, 2016 | 000-10661 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 10, 2016 | May 19, 2016 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2016 | May 19, 2016 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 6, 2016 | May 6, 2016 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 12, 2015 | Aug 10, 2015 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2015 | May 20, 2015 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 8, 2015 | May 7, 2015 | 000-10661 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 14, 2014 | Aug 11, 2014 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 12, 2014 | Aug 11, 2014 | 000-10661 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2014 | May 2, 2014 | 000-10661 |