| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 7, 2021 | Jul 3, 2021 | 000-31981 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 22, 2019 | Sep 28, 2018 | 000-31981 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 16, 2016 | Aug 2, 2016 | 000-31981 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 3, 2014 | Oct 1, 2014 | 000-31981 |