| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 25, 2023 | Dec 31, 2022 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 5, 2023 | Jan 4, 2023 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 28, 2022 | Feb 28, 2022 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 26, 2020 | Feb 25, 2020 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 6, 2019 | Feb 5, 2019 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 2, 2017 | Aug 1, 2017 | 000-16867 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2016 | Feb 10, 2016 | 000-16867 |