| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2021 | Aug 3, 2021 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 29, 2021 | Apr 27, 2021 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 6, 2020 | Aug 4, 2020 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 8, 2020 | May 6, 2020 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2020 | Feb 11, 2020 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 8, 2019 | Aug 7, 2019 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 4, 2019 | May 31, 2019 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 2, 2018 | Jul 31, 2018 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2018 | May 1, 2018 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2017 | Aug 8, 2017 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2017 | May 2, 2017 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 11, 2016 | Aug 9, 2016 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 13, 2016 | Jun 10, 2016 | 000-18548 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2016 | May 6, 2016 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 10, 2016 | May 6, 2016 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 17, 2016 | Feb 16, 2016 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 7, 2015 | May 5, 2015 | 001-36102 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 19, 2014 | Nov 17, 2014 | 001-36102 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 11, 2014 | Mar 7, 2014 | 001-36102 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Feb 28, 2014 | Feb 28, 2014 | 001-36102 |