| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Jan 5, 2022 | Jan 3, 2022 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Sep 1, 2021 | Aug 30, 2021 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 5, 2021 | Jan 4, 2021 | 000-24657 | 
| 4/A | Open Document | Open Filing | FORM 4/A | Jan 7, 2020 | Jan 2, 2020 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 6, 2020 | Jan 2, 2020 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jun 14, 2019 | Jun 12, 2019 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 3, 2019 | Jan 2, 2019 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 2, 2018 | Jan 2, 2018 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Aug 14, 2017 | Aug 10, 2017 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 5, 2017 | Jan 3, 2017 | 000-24657 | 
| 4/A | Open Document | Open Filing | FORM 4/A | Jun 30, 2016 | Jun 22, 2016 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jun 23, 2016 | Jun 22, 2016 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Jan 29, 2016 | Dec 21, 2015 | 000-24657 | 
| 4/A | Open Document | Open Filing | FORM 4/A | Dec 8, 2014 | Dec 4, 2014 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Dec 5, 2014 | Dec 4, 2014 | 000-24657 | 
| 4 | Open Document | Open Filing | FORM 4 | Nov 6, 2014 | Oct 29, 2014 | 000-24657 | 
| 3 | Open Document | Open Filing | FORM 3 | Nov 6, 2014 | Oct 28, 2014 | 000-24657 |