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Note 3 - Revenue (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Air Pollution Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Technology solutions |  | $ | 1,172 |  |  | $ | 2,326 |  |  | $ | 1,768 |  |  | $ | 4,524 |
Spare parts |  |  | 407 |  |  |  | 254 |  |  |  | 823 |  |  |  | 667 |
Ancillary revenue |  |  | 365 |  |  |  | 306 |  |  |  | 1,246 |  |  |  | 828 |
Total Air Pollution Control Technology revenues |  |  | 1,944 |  |  |  | 2,886 |  |  |  | 3,837 |  |  |  | 6,019 |
FUEL CHEM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FUEL CHEM technology solutions |  |  | 5,615 |  |  |  | 5,269 |  |  |  | 13,973 |  |  |  | 10,315 |
Total Revenues |  | $ | 7,559 |  |  | $ | 8,155 |  |  | $ | 17,810 |  |  | $ | 16,334 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
United States |  | $ | 6,049 |  |  | $ | 6,473 |  |  | $ | 15,100 |  |  | $ | 12,880 |
Foreign Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latin America |  |  | 121 |  |  |  | 195 |  |  |  | 338 |  |  |  | 400 |
Europe |  |  | 663 |  |  |  | 904 |  |  |  | 1,339 |  |  |  | 1,494 |
Asia |  |  | 726 |  |  |  | 583 |  |  |  | 1,033 |  |  |  | 1,560 |
Total Foreign Revenues |  |  | 1,510 |  |  |  | 1,682 |  |  |  | 2,710 |  |  |  | 3,454 |
Total Revenues |  | $ | 7,559 |  |  | $ | 8,155 |  |  | $ | 17,810 |  |  | $ | 16,334 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Products transferred at a point in time |  | $ | 6,387 |  |  | $ | 5,108 |  |  | $ | 16,042 |  |  | $ | 11,089 |
Products and services transferred over time |  |  | 1,172 |  |  |  | 3,047 |  |  |  | 1,768 |  |  |  | 5,245 |
Total Revenues |  | $ | 7,559 |  |  | $ | 8,155 |  |  | $ | 17,810 |  |  | $ | 16,334 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | As of |
|  | September 30, 2021 |  |  | December 31, 2020 |
Trade receivables |  | $ | 5,423 |  |  | $ | 5,015 |
Unbilled receivables |  |  | 375 |  |  |  | 2,348 |
Other short-term receivables |  |  | 102 |  |  |  | 20 |
Allowance for doubtful accounts |  |  | (838 | ) |  |  | (835 | )
Total accounts receivable |  | $ | 5,062 |  |  | $ | 6,548 |

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