| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | KHOEHN FORM 4 | Feb 17, 2023 | Feb 16, 2023 | 000-18059 |
| 4 | Open Document | Open Filing | KHOEHN FORM 4 | Feb 11, 2022 | Feb 9, 2022 | 000-18059 |
| 4 | Open Document | Open Filing | KHOEHN FORM 4 | Feb 1, 2022 | Jan 31, 2022 | 000-18059 |
| 4 | Open Document | Open Filing | KHOEHN FORM 4 | Feb 11, 2021 | Feb 10, 2021 | 000-18059 |
| 4 | Open Document | Open Filing | KHOEHN FORM 4 | Feb 13, 2020 | Feb 12, 2020 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 7, 2019 | Mar 6, 2019 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 9, 2018 | Mar 8, 2018 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 6, 2017 | Jun 15, 2017 | 000-18059 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 3, 2017 | Mar 1, 2017 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 17, 2016 | Jun 15, 2016 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 3, 2016 | Mar 2, 2016 | 000-18059 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 8, 2015 | Jun 8, 2015 | 000-18059 |
| 3 | Open Document | Open Filing | FORM 3 | Jun 8, 2015 | Jun 8, 2015 | 000-18059 |