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Note 3 - Revenue (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Air Pollution Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology solutions |  | $ | 1,966 |  |  | $ | 223 |  |  | $ | 3,807 |  |  | $ | 596 |
Spare parts |  |  | 262 |  |  |  | 236 |  |  |  | 358 |  |  |  | 416 |
Ancillary revenue |  |  | 510 |  |  |  | 527 |  |  |  | 777 |  |  |  | 881 |
Total Air Pollution Control technology revenues |  |  | 2,738 |  |  |  | 986 |  |  |  | 4,942 |  |  |  | 1,893 |
FUEL CHEM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 3,630 |  |  |  | 4,232 |  |  |  | 6,961 |  |  |  | 8,358 |
Total Revenues |  | $ | 6,368 |  |  | $ | 5,218 |  |  | $ | 11,903 |  |  | $ | 10,251 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
United States |  | $ | 4,279 |  |  | $ | 4,588 |  |  | $ | 7,967 |  |  | $ | 9,051 |
Foreign Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latin America |  |  | 60 |  |  |  | 142 |  |  |  | 129 |  |  |  | 217 |
Europe |  |  | 922 |  |  |  | 301 |  |  |  | 1,326 |  |  |  | 676 |
Asia |  |  | 1,107 |  |  |  | 187 |  |  |  | 2,481 |  |  |  | 307 |
Total Foreign Revenues |  |  | 2,089 |  |  |  | 630 |  |  |  | 3,936 |  |  |  | 1,200 |
Total Revenues |  | $ | 6,368 |  |  | $ | 5,218 |  |  | $ | 11,903 |  |  | $ | 10,251 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Products transferred at a point in time |  | $ | 4,402 |  |  | $ | 4,995 |  |  | $ | 8,096 |  |  | $ | 9,655 |
Products and services transferred over time |  |  | 1,966 |  |  |  | 223 |  |  |  | 3,807 |  |  |  | 596 |
Total Revenues |  | $ | 6,368 |  |  | $ | 5,218 |  |  | $ | 11,903 |  |  | $ | 10,251 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | June 30, 2022 |  |  | December 31, 2021 |
Trade receivables |  | $ | 5,500 |  |  | $ | 2,122 |
Unbilled receivables |  |  | 1,106 |  |  |  | 1,277 |
Other short-term receivables |  |  | 78 |  |  |  | 83 |
Allowance for doubtful accounts |  |  | (260 | ) |  |  | (223 | )
Total accounts receivable |  | $ | 6,424 |  |  | $ | 3,259 |

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