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v3.23.3

Note 11 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Revenues from external customers | $ 7,988 | $ 8,017 | $ 20,736 | $ 19,920
Cost of sales | (4,376) | (4,345) | (12,323) | (11,280)
Gross margin | 3,612 | 3,672 | 8,413 | 8,640
Selling, general and administrative | (2,966) | (3,273) | (9,126) | (9,201)
Research and development | (513) | (207) | (1,144) | (716)
Operating income (loss) from operations | 133 | 192 | (1,857) | (1,277)
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 | (2,966) | (3,273) | (9,126) | (9,201)
Research and development | (513) | (207) | (1,144) | (716)
Operating income (loss) from operations | (3,479) | (3,480) | (10,270) | (9,917)
Air Pollution Control [Member] |  |  |  |
Revenues from external customers | 3,711 | 2,728 | 10,692 | 7,670
Air Pollution Control [Member] | Operating Segments [Member] |  |  |  |
Revenues from external customers | 3,711 | 2,728 | 10,692 | 7,670
Cost of sales | (2,214) | (1,801) | (7,155) | (5,032)
Gross margin | 1,497 | 927 | 3,537 | 2,638
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 1,497 | 927 | 3,537 | 2,638
FUEL CHEM [Member] | Operating Segments [Member] |  |  |  |
Revenues from external customers | 4,277 | 5,289 | 10,044 | 12,250
Cost of sales | (2,162) | (2,544) | (5,168) | (6,248)
Gross margin | 2,115 | 2,745 | 4,876 | 6,002
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | $ 2,115 | $ 2,745 | $ 4,876 | $ 6,002

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