| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 31, 2022 | May 26, 2022 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 20, 2021 | May 19, 2021 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 6, 2020 | Aug 6, 2020 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 27, 2020 | May 22, 2020 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 3, 2019 | May 30, 2019 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 22, 2018 | May 18, 2018 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 9, 2017 | Jun 9, 2017 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 25, 2017 | May 24, 2017 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 1, 2016 | May 27, 2016 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 27, 2015 | May 22, 2015 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 21, 2015 | May 20, 2015 | 000-15386 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 27, 2014 | May 23, 2014 | 000-15386 |