| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Nov 17, 2021 | Nov 12, 2021 | 000-55802 | |
| 4 | Open Document | Open Filing | May 14, 2021 | May 12, 2021 | 000-55802 | |
| 4 | Open Document | Open Filing | Sep 17, 2019 | Sep 13, 2019 | 000-55802 | |
| 4 | Open Document | Open Filing | Feb 11, 2019 | Feb 8, 2019 | 000-55802 | |
| 4 | Open Document | Open Filing | Jan 4, 2018 | Jan 2, 2018 | 000-55802 | |
| 3 | Open Document | Open Filing | Jun 23, 2017 | Jun 23, 2017 | 000-55802 |