| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2021 | Aug 6, 2021 | 000-17948 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | May 14, 2021 | Apr 3, 2021 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 1, 2020 | Aug 31, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2020 | Aug 6, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 9, 2020 | Jul 7, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2020 | Jun 3, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2020 | May 20, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2020 | May 8, 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 20, 2020 | Dec 13, 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 12, 2019 | Aug 8, 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 5, 2019 | Aug 2, 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 15, 2019 | May 15, 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 7, 2018 | Sep 5, 2018 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 3, 2018 | Aug 2, 2018 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 21, 2017 | Nov 21, 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 1, 2017 | Aug 30, 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2017 | Aug 16, 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2017 | Aug 3, 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 1, 2017 | Jul 28, 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 16, 2016 | Nov 22, 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 2, 2016 | Aug 31, 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 1, 2016 | Jul 28, 2016 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 14, 2016 | Jun 10, 2016 | 001-35882 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2016 | Apr 2, 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 14, 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 7, 2015 | Aug 5, 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2015 | Jul 31, 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 17, 2015 | Jun 16, 2015 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 22, 2015 | May 20, 2015 | 001-35882 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2015 | Mar 28, 2015 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 19, 2015 | Mar 19, 2015 | 001-35882 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 23, 2014 | May 21, 2014 | 001-35882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 31, 2014 | Jul 31, 2014 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 18, 2014 | Jun 16, 2014 | 000-17948 |