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Note 3 - Revenue (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Air Pollution Control |  |  |  |  |  |  |  |
Technology solutions |  | $ | 571 |  |  | $ | 1,664 |
Spare parts |  |  | 251 |  |  |  | 199 |
Ancillary revenue |  |  | 481 |  |  |  | 455 |
Total Air Pollution Control technology revenues |  |  | 1,303 |  |  |  | 2,318 |
FUEL CHEM |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 5,079 |  |  |  | 2,639 |
Total Revenues |  | $ | 6,382 |  |  | $ | 4,957 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
United States |  | $ | 5,359 |  |  | $ | 3,595 |
Foreign Revenues |  |  |  |  |  |  |  |
Latin America |  |  | 348 |  |  |  | 315 |
Europe |  |  | 477 |  |  |  | 420 |
Africa |  |  | 38 |  |  |  | 436 |
Asia |  |  | 160 |  |  |  | 191 |
Total Foreign Revenues |  |  | 1,023 |  |  |  | 1,362 |
Total Revenues |  | $ | 6,382 |  |  | $ | 4,957 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Products transferred at a point in time |  | $ | 5,811 |  |  | $ | 3,293 |
Products and services transferred over time |  |  | 571 |  |  |  | 1,664 |
Total Revenues |  | $ | 6,382 |  |  | $ | 4,957 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | March 31, 2025 |  |  | December 31, 2024 |
Trade receivables |  | $ | 3,087 |  |  | $ | 5,375 |
Unbilled receivables |  |  | 572 |  |  |  | 2,075 |
Receivable for employee retention credit |  |  | 1,677 |  |  |  | 1,677 |
Other short-term receivables |  |  | 405 |  |  |  | 347 |
Allowance for credit losses |  |  | (106 | ) |  |  | (106 | )
Total accounts receivable |  | $ | 5,635 |  |  | $ | 9,368 |

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