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Note 7 - Warrants | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Warrants Disclosure [Text Block] | 7. WARRANTS On February 11, 2021, Fuel Tech entered into a securities purchase agreement to issue and sell, in a private placement, 5,000,000 shares of common stock and 2,500,000 warrants exercisable for a total of 2,500,000 shares of common stock with an exercise price of $5.10 per Warrant Share, at a purchase price of $5.1625 per Share and associated warrant. The Warrants expire on the five and one-half year anniversary of the effective date of the registration statement registering the Warrant Shares for resale. In addition, the Company issued to the placement agent Warrants to purchase up to 350,000 shares of common stock. The Placement Agent Warrants are exercisable at an exercise price of $6.45 per share of common stock and expire on the five and one-half year anniversary of the effective date of the registration statement registering the Shares and the Warrant Shares for resale. The issuance of warrants to purchase shares of the Company's common stock are summarized as follows:
|  | Shares |
Outstanding as of December 31, 2023 |  |  | 2,850,000 |
Granted |  |  | — |
Exercised |  |  | — |
Outstanding as of December 31, 2024 |  |  | 2,850,000 |
The following table summarizes information about warrants outstanding and exercisable at December 31, 2024:
|  |  |  | Number |  |  | Weighted-Average |  |  |  |  |
|  |  |  | Outstanding/ |  |  | Remaining Life |  |  | Weighted-Average |
Range of Exercise Price |  |  | Exercisable |  |  | in Years |  |  | Exercise Price |
$ | 5.10 |  |  |  | 2,500,000 |  |  |  | 1.62 |  |  | $ | 5.10 |
$ | 6.45 |  |  |  | 350,000 |  |  |  | 1.62 |  |  | $ | 6.45 |
|  |  |  |  | 2,850,000 |  |  |  |  |  |  |  |  |

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