| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 10 Sep 2021 | 16 Jul 2021 | 000-55751 | |
| 4 | Open Document | Open Filing | 25 Oct 2019 | 04 Jun 2019 | 000-55751 | |
| 4 | Open Document | Open Filing | 18 Dec 2018 | 01 Jun 2017 | 000-55751 | |
| 3 | Open Document | Open Filing | 15 May 2017 | 06 Jun 2016 | 000-55751 |