| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Aug 2021 | 06 Aug 2021 | 000-17948 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 May 2021 | 03 Apr 2021 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 Sep 2020 | 31 Aug 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Aug 2020 | 06 Aug 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Jul 2020 | 07 Jul 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Jun 2020 | 03 Jun 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 May 2020 | 20 May 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 May 2020 | 08 May 2020 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Feb 2020 | 13 Dec 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Aug 2019 | 08 Aug 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Aug 2019 | 02 Aug 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 15 May 2019 | 15 May 2019 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Sep 2018 | 05 Sep 2018 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Aug 2018 | 02 Aug 2018 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2017 | 21 Nov 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 Sep 2017 | 30 Aug 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Aug 2017 | 16 Aug 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Aug 2017 | 03 Aug 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 Aug 2017 | 28 Jul 2017 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Dec 2016 | 22 Nov 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Sep 2016 | 31 Aug 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 Aug 2016 | 28 Jul 2016 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Jun 2016 | 10 Jun 2016 | 001-35882 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 May 2016 | 02 Apr 2016 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Aug 2015 | 14 Aug 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Aug 2015 | 05 Aug 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Aug 2015 | 31 Jul 2015 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 Jun 2015 | 16 Jun 2015 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 22 May 2015 | 20 May 2015 | 001-35882 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 May 2015 | 28 Mar 2015 | 000-17948 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 19 Mar 2015 | 19 Mar 2015 | 001-35882 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 23 Oct 2014 | 21 May 2014 | 001-35882 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 31 Jul 2014 | 31 Jul 2014 | 000-17948 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Jun 2014 | 16 Jun 2014 | 000-17948 |