| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | Oct 30, 2023 | Oct 26, 2023 | 000-17272 |
| 4 | Open Document | Open Filing | Oct 31, 2022 | Oct 27, 2022 | 000-17272 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 1, 2021 | Oct 28, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 9, 2021 | Sep 7, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 10, 2020 | Nov 6, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 2, 2020 | Oct 29, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 28, 2019 | Oct 24, 2019 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 29, 2018 | Oct 25, 2018 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 30, 2017 | Oct 26, 2017 | 000-17272 |
| 4 | Open Document | Open Filing | FORM 4 | May 25, 2017 | May 23, 2017 | 001-36201 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 31, 2016 | Oct 27, 2016 | 000-17272 |
| 4 | Open Document | Open Filing | FORM 4 | May 26, 2016 | May 24, 2016 | 001-36201 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 2, 2015 | Oct 29, 2015 | 000-17272 |
| 4 | Open Document | Open Filing | Jun 23, 2015 | Jun 19, 2015 | 000-21214 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 9, 2015 | Jun 8, 2015 | 000-17272 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 13, 2015 | Apr 10, 2015 | 000-21214 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 26, 2015 | Mar 24, 2015 | 001-36201 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 5, 2015 | Jan 2, 2015 | 000-21214 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 3, 2014 | Oct 30, 2014 | 000-17272 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Apr 23, 2014 | Apr 23, 2014 | 001-36201 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Apr 16, 2014 | Apr 16, 2014 | 001-36201 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 28, 2014 | Feb 27, 2014 | 000-17272 |
| 4 | Open Document | Open Filing | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | Feb 13, 2014 | Feb 6, 2014 | 001-33560 |