| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 28, 2021 | Dec 23, 2021 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 3, 2021 | Mar 1, 2012 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 11, 2020 | Mar 9, 2020 | 000-17995 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Mar 11, 2020 | Mar 9, 2020 | 000-17995 |