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Note 11 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Revenues from external customers | $ 7,042 | $ 5,461 | $ 11,999 | $ 12,748
Cost of sales | (4,090) | (3,465) | (7,018) | (7,947)
Gross margin | 2,952 | 1,996 | 4,981 | 4,801
Selling, general and administrative | (3,245) | (2,915) | (6,590) | (6,160)
Research and development | (422) | (413) | (798) | (631)
Operating income (loss) from operations | (715) | (1,332) | (2,407) | (1,990)
Air Pollution Control [Member] |  |  |  |
Revenues from external customers | 3,949 | 3,422 | 6,267 | 6,981
Cost of sales | (2,405) | (2,347) | (3,833) | (4,941)
Gross margin | 1,544 | 1,075 | 2,434 | 2,040
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 1,544 | 1,075 | 2,434 | 2,040
FUEL CHEM [Member] |  |  |  |
Revenues from external customers | 3,093 | 2,039 | 5,732 | 5,767
Cost of sales | (1,685) | (1,118) | (3,185) | (3,006)
Gross margin | 1,408 | 921 | 2,547 | 2,761
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 1,408 | 921 | 2,547 | 2,761
Other Operating Segment [Member] |  |  |  |
Revenues from external customers | 0 | 0 | 0 | 0
Cost of sales | 0 | 0 | 0 | 0
Gross margin | 0 | 0 | 0 | 0
Selling, general and administrative | (3,245) | (2,915) | (6,590) | (6,160)
Research and development | (422) | (413) | (798) | (631)
Operating income (loss) from operations | $ (3,667) | $ (3,328) | $ (7,388) | $ (6,791)

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