| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2025 | May 22, 2025 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 24, 2024 | Jun 21, 2024 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 24, 2024 | Jun 21, 2024 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 15, 2024 | Mar 14, 2024 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 14, 2023 | Dec 12, 2023 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 7, 2023 | Aug 4, 2023 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 22, 2023 | May 19, 2023 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2023 | Mar 15, 2023 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 13, 2022 | Dec 9, 2022 | 000-16540 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 31, 2022 | Aug 26, 2022 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 30, 2022 | Aug 26, 2022 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 13, 2022 | May 11, 2022 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 13, 2022 | May 11, 2022 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2022 | Feb 24, 2022 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2021 | Dec 9, 2021 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 12, 2021 | Aug 11, 2021 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 3, 2021 | Jun 1, 2021 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 11, 2021 | May 11, 2021 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2021 | May 4, 2021 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 30, 2020 | Nov 25, 2020 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 3, 2020 | Sep 2, 2020 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2020 | Jul 31, 2020 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 1, 2019 | Oct 31, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 31, 2019 | May 30, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 11, 2019 | Mar 7, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2019 | Feb 25, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2019 | Feb 22, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 21, 2019 | Feb 20, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 21, 2019 | Feb 19, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 19, 2019 | Feb 14, 2019 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2017 | May 12, 2017 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 10, 2016 | May 6, 2016 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 17, 2015 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 17, 2015 | Aug 12, 2015 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 23, 2015 | Feb 20, 2015 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 6, 2015 | Feb 4, 2015 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 1, 2014 | Nov 28, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 25, 2014 | Aug 21, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 27, 2014 | May 21, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2014 | May 19, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 18, 2014 | Feb 14, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 5, 2014 | Feb 4, 2014 | 000-16540 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 4, 2014 | Feb 3, 2014 | 000-16540 |