| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Sep 14, 2021 | Sep 10, 2021 | 000-52522 | |
| 4 | Open Document | Open Filing | Nov 25, 2020 | Nov 23, 2020 | 000-52522 | |
| 4 | Open Document | Open Filing | Nov 2, 2020 | Oct 30, 2020 | 000-52522 | |
| 3 | Open Document | Open Filing | Oct 9, 2020 | Jul 26, 2017 | 000-52522 |