| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Mar 4, 2022 | Mar 2, 2022 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 24, 2021 | Nov 22, 2021 | 000-21121 | 
| 4 | Open Document | Open Filing | FORM 4 | Mar 8, 2021 | Mar 4, 2021 | 000-21121 | 
| 4 | Open Document | Open Filing | FORM 4 | May 4, 2020 | Apr 30, 2020 | 000-21121 | 
| 4 | Open Document | Open Filing | FORM 4 | Mar 2, 2020 | Feb 27, 2020 | 000-21121 | 
| 4 | Open Document | Open Filing | FORM 4 | Mar 1, 2019 | Feb 27, 2019 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 5, 2018 | Mar 1, 2018 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 8, 2017 | Nov 6, 2017 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 11, 2017 | Aug 10, 2017 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 24, 2017 | May 22, 2017 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 29, 2016 | Feb 25, 2016 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 2, 2015 | Nov 30, 2015 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 30, 2015 | Nov 25, 2015 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 19, 2015 | Nov 17, 2015 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 2, 2015 | Feb 26, 2015 | 000-21121 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 28, 2014 | Feb 27, 2014 | 000-21121 |