| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 144 | Open Document | Open Filing | 30 May 2024 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Dec 2023 | 14 Dec 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 13 Nov 2023 | 10 Nov 2023 | 000-30941 |
| 144 | Open Document | Open Filing | 06 Nov 2023 | |||
| 144 | Open Document | Open Filing | 07 Aug 2023 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Jun 2023 | 12 Jun 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 07 Jun 2023 | 07 Jun 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Jun 2023 | 06 Jun 2023 | 000-30941 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | 06 Jun 2023 | 25 May 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 25 May 2023 | 25 May 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 19 May 2023 | 17 May 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 May 2023 | 16 May 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 15 May 2023 | 15 May 2023 | 000-30941 |
| 144 | Open Document | Open Filing | 09 May 2023 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 13 Feb 2023 | 13 Feb 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Dec 2022 | 14 Dec 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 30 Nov 2022 | 30 Nov 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Nov 2022 | 10 Nov 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 25 Aug 2022 | 25 Aug 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 May 2022 | 16 May 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 28 Feb 2022 | 25 Feb 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 09 Dec 2021 | 08 Dec 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 27 Aug 2021 | 26 Aug 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2021 | 17 May 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 Feb 2021 | 16 Feb 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 03 Nov 2020 | 02 Nov 2020 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 15 May 2020 | 15 May 2020 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 05 Nov 2019 | 01 Nov 2019 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 15 May 2019 | 15 May 2019 | 000-30941 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Dec 2018 | 31 Oct 2018 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Nov 2018 | 01 Nov 2018 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2018 | 16 May 2018 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Mar 2018 | 14 Mar 2018 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | 09 Mar 2018 | 07 Mar 2018 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | 20 Feb 2018 | 20 Feb 2018 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Jan 2018 | 04 Jan 2018 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Nov 2017 | 01 Nov 2017 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 | 07 Sep 2017 | 05 Sep 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 08 Jun 2017 | 07 Jun 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jun 2017 | 02 Jun 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 31 May 2017 | 31 May 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2017 | 17 May 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | 09 May 2017 | 05 May 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | 08 May 2017 | 04 May 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | 07 Mar 2017 | 03 Mar 2017 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 28 Nov 2016 | 25 Nov 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Nov 2016 | 01 Nov 2016 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Sep 2016 | 02 Sep 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Jun 2016 | 01 Jun 2016 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2016 | 16 May 2016 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 May 2016 | 04 May 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Mar 2016 | 02 Mar 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 30 Nov 2015 | 27 Nov 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Nov 2015 | 01 Nov 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Sep 2015 | 08 Sep 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Sep 2015 | 01 Sep 2015 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 Jul 2015 | 15 Jul 2015 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Jun 2015 | 09 Jun 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Jun 2015 | 04 Jun 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 May 2015 | 07 May 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Mar 2015 | 10 Mar 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Mar 2015 | 03 Mar 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Dec 2014 | 28 Nov 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Nov 2014 | 20 Nov 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Nov 2014 | 03 Nov 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Nov 2014 | 31 Oct 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Aug 2014 | 20 Aug 2014 | 001-15885 |
| 4 | Open Document | Open Filing | KEITHLEY 2014 OPTION GRANT | 17 Jul 2014 | 15 Jul 2014 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Jun 2014 | 04 Jun 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 May 2014 | 08 May 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Mar 2014 | 06 Mar 2014 | 001-15885 |
| 4 | Open Document | Open Filing | KEITHLEY 2013 MARKET PURCHASE | 03 Mar 2014 | 15 Aug 2013 | 000-30941 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Feb 2014 | 31 Dec 2013 | 001-15885 |