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Note 11 - Business Segment and Geographic Financial Data (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Three months ended June 30, 2023 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 3,422 |  |  | $ | 2,039 |  |  | $ | — |  |  | $ | 5,461 |
Cost of sales |  |  | (2,347 | ) |  |  | (1,118 | ) |  |  | — |  |  |  | (3,465 | )
Gross margin |  |  | 1,075 |  |  |  | 921 |  |  |  | — |  |  |  | 1,996 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (2,915 | ) |  |  | (2,915 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (413 | ) |  |  | (413 | )
Operating income (loss) from operations |  | $ | 1,075 |  |  | $ | 921 |  |  | $ | (3,328 | ) |  | $ | (1,332 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Three months ended June 30, 2022 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 2,738 |  |  | $ | 3,630 |  |  | $ | — |  |  | $ | 6,368 |
Cost of sales |  |  | (1,802 | ) |  |  | (1,888 | ) |  |  | — |  |  |  | (3,690 | )
Gross margin |  |  | 936 |  |  |  | 1,742 |  |  |  | — |  |  |  | 2,678 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (2,874 | ) |  |  | (2,874 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (289 | ) |  |  | (289 | )
Operating income (loss) from operations |  | $ | 936 |  |  | $ | 1,742 |  |  | $ | (3,163 | ) |  | $ | (485 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Six months ended June 30, 2023 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 6,981 |  |  | $ | 5,767 |  |  | $ | — |  |  | $ | 12,748 |
Cost of sales |  |  | (4,941 | ) |  |  | (3,006 | ) |  |  | — |  |  |  | (7,947 | )
Gross margin |  |  | 2,040 |  |  |  | 2,761 |  |  |  | — |  |  |  | 4,801 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (6,160 | ) |  |  | (6,160 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (631 | ) |  |  | (631 | )
Operating income (loss) from operations |  | $ | 2,040 |  |  | $ | 2,761 |  |  | $ | (6,791 | ) |  | $ | (1,990 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Six months ended June 30, 2022 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 4,942 |  |  | $ | 6,961 |  |  | $ | — |  |  | $ | 11,903 |
Cost of sales |  |  | (3,231 | ) |  |  | (3,704 | ) |  |  | — |  |  |  | (6,935 | )
Gross margin |  |  | 1,711 |  |  |  | 3,257 |  |  |  | — |  |  |  | 4,968 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (5,928 | ) |  |  | (5,928 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (509 | ) |  |  | (509 | )
Operating income (loss) from operations |  | $ | 1,711 |  |  | $ | 3,257 |  |  | $ | (6,437 | ) |  | $ | (1,469 | )
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,316 |  |  | $ | 4,279 |  |  | $ | 10,297 |  |  | $ | 7,967 |
Foreign |  |  | 1,145 |  |  |  | 2,089 |  |  |  | 2,451 |  |  |  | 3,936 |
|  | $ | 5,461 |  |  | $ | 6,368 |  |  | $ | 12,748 |  |  | $ | 11,903 |
|  | June 30, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Assets: |  |  |  |  |  |  |  |
United States |  | $ | 46,191 |  |  | $ | 47,007 |
Foreign |  |  | 3,418 |  |  |  | 3,117 |
|  | $ | 49,609 |  |  | $ | 50,124 |

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