| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 04 Aug 2021 | 03 Aug 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 04 May 2021 | 03 May 2021 | 000-14939 | |
| 4 | Open Document | Open Filing | 05 May 2020 | 01 May 2020 | 000-14939 | |
| 4 | Open Document | Open Filing | 02 May 2019 | 01 May 2019 | 000-14939 | |
| 4 | Open Document | Open Filing | 24 Sep 2018 | 21 Sep 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | 05 Sep 2018 | 04 Sep 2018 | 000-14939 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 03 May 2018 | 01 May 2018 | 000-14939 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 03 May 2018 | 02 Aug 2017 | 000-14939 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 12 Oct 2016 | 10 Oct 2016 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 02 Aug 2016 | 01 Aug 2016 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 19 Feb 2016 | 17 Feb 2016 | 001-12147 |
| 5 | Open Document | Open Filing | FORM 5 SUBMISSION | 10 Feb 2016 | 31 Dec 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 30 Nov 2015 | 25 Nov 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 03 Mar 2015 | 03 Mar 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 25 Feb 2015 | 24 Feb 2015 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 20 Feb 2015 | 18 Feb 2015 | 001-12147 |
| 5 | Open Document | Open Filing | FORM 5 SUBMISSION | 12 Feb 2015 | 31 Dec 2014 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 21 Feb 2014 | 19 Feb 2014 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 18 Mar 2013 | 15 Mar 2013 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Mar 2013 | 04 Mar 2013 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 22 Feb 2013 | 20 Feb 2013 | 001-12147 |
| 5 | Open Document | Open Filing | FORM 5 | 13 Feb 2013 | 31 Dec 2012 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 07 Jan 2013 | 04 Jan 2013 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 03 Jan 2013 | 02 Jan 2013 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 26 Dec 2012 | 21 Dec 2012 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 21 Feb 2012 | 20 Feb 2012 | 001-12147 |
| 4 | Open Document | Open Filing | FORM 4 | 17 Feb 2012 | 15 Feb 2012 | 001-12147 |