| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | 20 Jul 2022 | 15 Jul 2022 | 000-55831 |
| 4 | Open Document | Open Filing | FORM 4 | 01 Oct 2021 | 21 Sep 2021 | 000-55831 |
| 4 | Open Document | Open Filing | FORM 4 | 14 Jan 2020 | 27 Dec 2019 | 000-55831 |
| 4 | Open Document | Open Filing | FORM 4 | 06 Nov 2019 | 05 Nov 2019 | 000-55831 |
| 4 | Open Document | Open Filing | FORM 4 | 08 Aug 2019 | 31 Jul 2019 | 000-55831 |
| 4 | Open Document | Open Filing | FORM 4 | 13 Dec 2018 | 11 Dec 2018 | 000-55831 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 29 Aug 2017 | 29 Aug 2017 | 000-55831 |