| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 144 | Open Document | Open Filing | May 30, 2024 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 14, 2023 | Dec 14, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 13, 2023 | Nov 10, 2023 | 000-30941 |
| 144 | Open Document | Open Filing | Nov 6, 2023 | |||
| 144 | Open Document | Open Filing | Aug 7, 2023 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 14, 2023 | Jun 12, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 7, 2023 | Jun 7, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 6, 2023 | Jun 6, 2023 | 000-30941 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | Jun 6, 2023 | May 25, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 25, 2023 | May 25, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 19, 2023 | May 17, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 16, 2023 | May 16, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 15, 2023 | May 15, 2023 | 000-30941 |
| 144 | Open Document | Open Filing | May 9, 2023 | |||
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 13, 2023 | Feb 13, 2023 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 14, 2022 | Dec 14, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 30, 2022 | Nov 30, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 14, 2022 | Nov 10, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 25, 2022 | Aug 25, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 16, 2022 | May 16, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 28, 2022 | Feb 25, 2022 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 9, 2021 | Dec 8, 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 27, 2021 | Aug 26, 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 17, 2021 | May 17, 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 17, 2021 | Feb 16, 2021 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 3, 2020 | Nov 2, 2020 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 15, 2020 | May 15, 2020 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Nov 5, 2019 | Nov 1, 2019 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 15, 2019 | May 15, 2019 | 000-30941 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 14, 2018 | Oct 31, 2018 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 5, 2018 | Nov 1, 2018 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 17, 2018 | May 16, 2018 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 14, 2018 | Mar 14, 2018 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 9, 2018 | Mar 7, 2018 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 20, 2018 | Feb 20, 2018 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 5, 2018 | Jan 4, 2018 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 3, 2017 | Nov 1, 2017 | 000-07977 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 7, 2017 | Sep 5, 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 8, 2017 | Jun 7, 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 5, 2017 | Jun 2, 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 31, 2017 | May 31, 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 17, 2017 | May 17, 2017 | 000-30941 |
| 4 | Open Document | Open Filing | FORM 4 | May 9, 2017 | May 5, 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | May 8, 2017 | May 4, 2017 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 7, 2017 | Mar 3, 2017 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 28, 2016 | Nov 25, 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 2, 2016 | Nov 1, 2016 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 7, 2016 | Sep 2, 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 2, 2016 | Jun 1, 2016 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 17, 2016 | May 16, 2016 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 9, 2016 | May 4, 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 4, 2016 | Mar 2, 2016 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 30, 2015 | Nov 27, 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 3, 2015 | Nov 1, 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 9, 2015 | Sep 8, 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 2, 2015 | Sep 1, 2015 | 001-15885 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jul 16, 2015 | Jul 15, 2015 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 11, 2015 | Jun 9, 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2015 | Jun 4, 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 11, 2015 | May 7, 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 12, 2015 | Mar 10, 2015 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 5, 2015 | Mar 3, 2015 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 2, 2014 | Nov 28, 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 21, 2014 | Nov 20, 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 4, 2014 | Nov 3, 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 3, 2014 | Oct 31, 2014 | 000-07977 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 21, 2014 | Aug 20, 2014 | 001-15885 |
| 4 | Open Document | Open Filing | KEITHLEY 2014 OPTION GRANT | Jul 17, 2014 | Jul 15, 2014 | 000-30941 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2014 | Jun 4, 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 9, 2014 | May 8, 2014 | 001-15885 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 10, 2014 | Mar 6, 2014 | 001-15885 |
| 4 | Open Document | Open Filing | KEITHLEY 2013 MARKET PURCHASE | Mar 3, 2014 | Aug 15, 2013 | 000-30941 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2014 | Dec 31, 2013 | 001-15885 |