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v3.23.2

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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Revenues from external customers | $ 5,461 | $ 6,368 | $ 12,748 | $ 11,903
Cost of sales | (3,465) | (3,690) | (7,947) | (6,935)
Gross margin | 1,996 | 2,678 | 4,801 | 4,968
Selling, general and administrative | (2,915) | (2,874) | (6,160) | (5,928)
Research and development | (413) | (289) | (631) | (509)
Operating income (loss) from operations | (1,332) | (485) | (1,990) | (1,469)
Segment Reconciling Items [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 | (2,915) | (2,874) | (6,160) | (5,928)
Research and development | (413) | (289) | (631) | (509)
Operating income (loss) from operations | (3,328) | (3,163) | (6,791) | (6,437)
Air Pollution Control [Member] |  |  |  |
Revenues from external customers | 3,422 | 2,738 | 6,981 | 4,942
Air Pollution Control [Member] | Operating Segments [Member] |  |  |  |
Revenues from external customers | 3,422 | 2,738 | 6,981 | 4,942
Cost of sales | (2,347) | (1,802) | (4,941) | (3,231)
Gross margin | 1,075 | 936 | 2,040 | 1,711
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 1,075 | 936 | 2,040 | 1,711
FUEL CHEM [Member] | Operating Segments [Member] |  |  |  |
Revenues from external customers | 2,039 | 3,630 | 5,767 | 6,961
Cost of sales | (1,118) | (1,888) | (3,006) | (3,704)
Gross margin | 921 | 1,742 | 2,761 | 3,257
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | $ 921 | $ 1,742 | $ 2,761 | $ 3,257

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