| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 19, 2021 | Aug 18, 2021 | 000-12456 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 30, 2021 | Jun 29, 2021 | 000-12456 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 25, 2020 | Jun 24, 2020 | 000-12456 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 3, 2019 | Aug 21, 2019 | 000-12456 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Jan 4, 2019 | Jan 1, 2019 | 000-12456 |