| Date Filed | Type | Description |
| 08/08/2023 |
10-Q
| Quarterly Report for the period ended June 30, 2023 |
| 08/08/2023 |
8-K
| Quarterly results |
| 06/12/2023 |
8-K
| Submission of Matters to a Vote of Security Holders Interactive Data |
| 05/09/2023 |
10-Q
| Quarterly Report for the period ended March 31, 2023 |
| 05/09/2023 |
8-K
| Quarterly results |
| 04/19/2023 |
DEFA14A
| Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material: |
| 04/17/2023 |
DEF 14A
| Form DEF 14A - Other definitive proxy statements: |
| 03/07/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
| 03/07/2023 |
8-K
| Quarterly results |
| 01/27/2023 |
SC 13G/A
| GRACE & WHITE INC reports a 5.7% stake in FUEL TECH,INC. |
| 12/12/2022 |
8-K
| Quarterly results |
| 11/08/2022 |
10-Q
| Quarterly Report for the period ended September 30, 2022 |
| 11/08/2022 |
8-K
| Quarterly results |
| 09/14/2022 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits Interactive Data |
| 08/10/2022 |
10-Q
| Quarterly Report for the period ended June 30, 2022 |
| 08/10/2022 |
8-K
| Quarterly results |
| 06/07/2022 |
8-K
| Quarterly results |
| 06/03/2022 |
8-K
| Quarterly results |
| 05/10/2022 |
10-Q
| Quarterly Report for the period ended March 31, 2022 |
| 05/10/2022 |
8-K
| Quarterly results |
| 04/11/2022 |
DEF 14A
| Form DEF 14A - Other definitive proxy statements: |
| 04/11/2022 |
8-K
| Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements... |
| 03/08/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 03/08/2022 |
8-K
| Quarterly results |
| 02/10/2022 |
SC 13G/A
| RENAISSANCE TECHNOLOGIES LLC reports a 2.7% stake in FUEL TECH, INC. |
| 01/10/2022 |
SC 13G
| GRACE & WHITE INC reports a 5.1% stake in FUEL TECH,INC. |
| 12/14/2021 |
8-K
| Quarterly results |
| 11/09/2021 |
10-Q
| Quarterly Report for the period ended September 30, 2021 |
| 11/09/2021 |
8-K
| Quarterly results |
| 09/13/2021 |
8-K
| Quarterly results |
| 08/10/2021 |
10-Q
| Quarterly Report for the period ended June 30, 2021 |
| 08/10/2021 |
8-K
| Quarterly results |
| 05/24/2021 |
8-K
| Quarterly results |
| 05/13/2021 |
DEFA14A
| Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material: |
|