| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Nov 24, 2021 | Nov 23, 2021 | 000-24657 |
| 4 | Open Document | Open Filing | FORM 4 | Apr 3, 2018 | Apr 2, 2018 | 000-24657 |
| 3 | Open Document | Open Filing | FORM 3 | Jul 13, 2015 | Jul 2, 2015 | 000-24657 |