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Note 3 - Revenue (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Air Pollution Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology solutions |  | $ | 2,619 |  |  | $ | 2,557 |  |  | $ | 4,283 |  |  | $ | 5,539 |
Spare parts |  |  | 805 |  |  |  | 425 |  |  |  | 1,004 |  |  |  | 599 |
Ancillary revenue |  |  | 525 |  |  |  | 440 |  |  |  | 980 |  |  |  | 843 |
Total Air Pollution Control technology revenues |  |  | 3,949 |  |  |  | 3,422 |  |  |  | 6,267 |  |  |  | 6,981 |
FUEL CHEM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 3,093 |  |  |  | 2,039 |  |  |  | 5,732 |  |  |  | 5,767 |
Total Revenues |  | $ | 7,042 |  |  | $ | 5,461 |  |  | $ | 11,999 |  |  | $ | 12,748 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
United States |  | $ | 4,471 |  |  | $ | 4,316 |  |  | $ | 8,066 |  |  | $ | 10,297 |
Foreign Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latin America |  |  | 293 |  |  |  | 153 |  |  |  | 608 |  |  |  | 153 |
Europe |  |  | 1,688 |  |  |  | 820 |  |  |  | 2,544 |  |  |  | 1,399 |
Asia |  |  | 590 |  |  |  | 172 |  |  |  | 781 |  |  |  | 899 |
Total Foreign Revenues |  |  | 2,571 |  |  |  | 1,145 |  |  |  | 3,933 |  |  |  | 2,451 |
Total Revenues |  | $ | 7,042 |  |  | $ | 5,461 |  |  | $ | 11,999 |  |  | $ | 12,748 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Products transferred at a point in time |  | $ | 4,423 |  |  | $ | 2,904 |  |  | $ | 7,716 |  |  | $ | 7,209 |
Products and services transferred over time |  |  | 2,619 |  |  |  | 2,557 |  |  |  | 4,283 |  |  |  | 5,539 |
Total Revenues |  | $ | 7,042 |  |  | $ | 5,461 |  |  | $ | 11,999 |  |  | $ | 12,748 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | June 30, 2024 |  |  | December 31, 2023 |
Trade receivables |  | $ | 5,182 |  |  | $ | 4,300 |
Unbilled receivables |  |  | 1,543 |  |  |  | 2,285 |
Receivable for employee retention credit |  |  | 1,677 |  |  |  | — |
Other short-term receivables |  |  | 355 |  |  |  | 255 |
Allowance for credit losses |  |  | (106 | ) |  |  | (111 | )
Total accounts receivable |  | $ | 8,651 |  |  | $ | 6,729 |

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