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Note 3 - Revenue (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Air Pollution Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology solutions |  | $ | 1,910 |  |  | $ | 1,904 |  |  | $ | 7,449 |  |  | $ | 5,711 |
Spare parts |  |  | 1,339 |  |  |  | 384 |  |  |  | 1,938 |  |  |  | 742 |
Ancillary revenue |  |  | 462 |  |  |  | 440 |  |  |  | 1,305 |  |  |  | 1,217 |
Total Air Pollution Control technology revenues |  |  | 3,711 |  |  |  | 2,728 |  |  |  | 10,692 |  |  |  | 7,670 |
FUEL CHEM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 4,277 |  |  |  | 5,289 |  |  |  | 10,044 |  |  |  | 12,250 |
Total Revenues |  | $ | 7,988 |  |  | $ | 8,017 |  |  | $ | 20,736 |  |  | $ | 19,920 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
United States |  | $ | 5,640 |  |  | $ | 6,972 |  |  | $ | 15,937 |  |  | $ | 14,939 |
Foreign Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latin America |  |  | 157 |  |  |  | 56 |  |  |  | 310 |  |  |  | 185 |
Europe |  |  | 1,001 |  |  |  | 613 |  |  |  | 2,400 |  |  |  | 1,939 |
Asia |  |  | 1,190 |  |  |  | 376 |  |  |  | 2,089 |  |  |  | 2,857 |
Total Foreign Revenues |  |  | 2,348 |  |  |  | 1,045 |  |  |  | 4,799 |  |  |  | 4,981 |
Total Revenues |  | $ | 7,988 |  |  | $ | 8,017 |  |  | $ | 20,736 |  |  | $ | 19,920 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Products transferred at a point in time |  | $ | 6,078 |  |  | $ | 5,969 |  |  | $ | 13,287 |  |  | $ | 14,065 |
Products and services transferred over time |  |  | 1,910 |  |  |  | 2,048 |  |  |  | 7,449 |  |  |  | 5,855 |
Total Revenues |  | $ | 7,988 |  |  | $ | 8,017 |  |  | $ | 20,736 |  |  | $ | 19,920 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | September 30, 2023 |  |  | December 31, 2022 |
Trade receivables |  | $ | 5,717 |  |  | $ | 4,605 |
Unbilled receivables |  |  | 1,944 |  |  |  | 3,082 |
Other short-term receivables |  |  | 145 |  |  |  | 152 |
Allowance for credit losses |  |  | (110 | ) |  |  | (110 | )
Total accounts receivable |  | $ | 7,696 |  |  | $ | 7,729 |

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