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Note 3 - Revenue (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Air Pollution Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology solutions |  | $ | 2,557 |  |  | $ | 1,966 |  |  | $ | 5,539 |  |  | $ | 3,807 |
Spare parts |  |  | 425 |  |  |  | 262 |  |  |  | 599 |  |  |  | 358 |
Ancillary revenue |  |  | 440 |  |  |  | 510 |  |  |  | 843 |  |  |  | 777 |
Total Air Pollution Control technology revenues |  |  | 3,422 |  |  |  | 2,738 |  |  |  | 6,981 |  |  |  | 4,942 |
FUEL CHEM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 2,039 |  |  |  | 3,630 |  |  |  | 5,767 |  |  |  | 6,961 |
Total Revenues |  | $ | 5,461 |  |  | $ | 6,368 |  |  | $ | 12,748 |  |  | $ | 11,903 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
United States |  | $ | 4,316 |  |  | $ | 4,279 |  |  | $ | 10,297 |  |  | $ | 7,967 |
Foreign Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latin America |  |  | 153 |  |  |  | 60 |  |  |  | 153 |  |  |  | 129 |
Europe |  |  | 820 |  |  |  | 922 |  |  |  | 1,399 |  |  |  | 1,326 |
Asia |  |  | 172 |  |  |  | 1,107 |  |  |  | 899 |  |  |  | 2,481 |
Total Foreign Revenues |  |  | 1,145 |  |  |  | 2,089 |  |  |  | 2,451 |  |  |  | 3,936 |
Total Revenues |  | $ | 5,461 |  |  | $ | 6,368 |  |  | $ | 12,748 |  |  | $ | 11,903 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Products transferred at a point in time |  | $ | 2,904 |  |  | $ | 4,402 |  |  | $ | 7,209 |  |  | $ | 8,096 |
Products and services transferred over time |  |  | 2,557 |  |  |  | 1,966 |  |  |  | 5,539 |  |  |  | 3,807 |
Total Revenues |  | $ | 5,461 |  |  | $ | 6,368 |  |  | $ | 12,748 |  |  | $ | 11,903 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | June 30, 2023 |  |  | December 31, 2022 |
Trade receivables |  | $ | 3,804 |  |  | $ | 4,605 |
Unbilled receivables |  |  | 2,946 |  |  |  | 3,082 |
Other short-term receivables |  |  | 141 |  |  |  | 152 |
Allowance for credit losses |  |  | (110 | ) |  |  | (110 | )
Total accounts receivable |  | $ | 6,781 |  |  | $ | 7,729 |

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