| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Feb 25, 2022 | Feb 23, 2022 | 000-14939 | |
| 4 | Open Document | Open Filing | May 27, 2021 | May 26, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Mar 22, 2021 | Mar 17, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Feb 23, 2021 | Feb 19, 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 11, 2020 | Sep 10, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 8, 2020 | Sep 3, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | May 27, 2020 | May 22, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Feb 25, 2020 | Feb 21, 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | Jan 2, 2020 | Dec 30, 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | Sep 4, 2019 | Aug 29, 2019 | 000-14939 | |
| 3 | Open Document | Open Filing | Sep 4, 2019 | Aug 28, 2019 | 000-14939 |