| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Dec 9, 2022 | Dec 7, 2022 | 000-17272 | |
| 4 | Open Document | Open Filing | FORM 4 | Aug 17, 2022 | Aug 15, 2022 | 000-17272 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 10, 2022 | Aug 8, 2022 | 000-17272 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 9, 2022 | Aug 7, 2022 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 7, 2021 | Sep 2, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 2, 2021 | Aug 31, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 23, 2021 | Aug 19, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2021 | Aug 6, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2021 | Mar 1, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 17, 2021 | Feb 12, 2021 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 2, 2020 | Nov 30, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 11, 2020 | Aug 9, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 7, 2020 | Aug 5, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 13, 2020 | Jul 9, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 1, 2020 | May 28, 2020 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 17, 2019 | Dec 12, 2019 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 21, 2019 | Aug 19, 2019 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 9, 2019 | Aug 7, 2019 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 29, 2019 | May 24, 2019 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 9, 2018 | Aug 7, 2018 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 30, 2017 | Oct 26, 2017 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 5, 2017 | Jul 1, 2017 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 22, 2016 | Aug 18, 2016 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 6, 2016 | Jul 1, 2016 | 000-17272 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 20, 2015 | Aug 7, 2015 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 11, 2015 | Aug 7, 2015 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 14, 2014 | Aug 12, 2014 | 000-17272 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 6, 2014 | Aug 4, 2014 | 000-17272 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 6, 2014 | Aug 4, 2014 | 000-17272 |