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Note 2 - Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Twelve Months Ended December 31, |
|  | 2024 |  |  | 2023 |
Air Pollution Control |  |  |  |  |  |  |  |
Technology solutions |  | $ | 7,897 |  |  | $ | 9,497 |
Spare parts |  |  | 1,616 |  |  |  | 2,239 |
Ancillary revenue |  |  | 1,729 |  |  |  | 1,747 |
Total Air Pollution Control technology |  |  | 11,242 |  |  |  | 13,483 |
FUEL CHEM |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 13,891 |  |  |  | 13,598 |
Total Revenues |  | $ | 25,133 |  |  | $ | 27,081 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Twelve Months Ended December 31, |
|  | 2024 |  |  | 2023 |
United States |  | $ | 17,802 |  |  | $ | 21,397 |
Foreign Revenues |  |  |  |  |  |  |  |
Americas |  |  | 924 |  |  |  | 577 |
Europe |  |  | 2,146 |  |  |  | 2,558 |
South Africa |  |  | 2,570 |  |  |  | 163 |
Pacific Rim and other |  |  | 1,691 |  |  |  | 2,386 |
Total Foreign Revenues |  |  | 7,331 |  |  |  | 5,684 |
Total Revenues |  | $ | 25,133 |  |  | $ | 27,081 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Twelve Months Ended December 31, |
|  | 2024 |  |  | 2023 |
Products transferred at a point in time |  | $ | 17,236 |  |  | $ | 17,584 |
Products and services transferred over time |  |  | 7,897 |  |  |  | 9,497 |
Total Revenues |  | $ | 25,133 |  |  | $ | 27,081 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | December 31, 2024 |  |  | December 31, 2023 |
Trade receivables |  | $ | 5,375 |  |  | $ | 4,300 |
Unbilled receivables |  |  | 2,075 |  |  |  | 2,285 |
Receivable for employee retention credit |  |  | 1,677 |  |  |  | — |
Other short-term receivables |  |  | 347 |  |  |  | 255 |
Allowance for credit losses |  |  | (106 | ) |  |  | (111 | )
Total accounts receivable |  | $ | 9,368 |  |  | $ | 6,729 |

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