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v3.23.1

Note 11 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Revenues from external customers | $ 7,287 | $ 5,535
Cost of sales | (4,482) | (3,245)
Gross margin | 2,805 | 2,290
Selling, general and administrative | (3,245) | (3,054)
Research and development | (218) | (220)
Operating income (loss) from operations | (658) | (984)
Segment Reconciling Items [Member] |  |
Revenues from external customers | 0 | 0
Cost of sales | 0 | 0
Gross margin | 0 | 0
Selling, general and administrative | (3,245) | (3,054)
Research and development | (218) | (220)
Operating income (loss) from operations | (3,463) | (3,274)
Air Pollution Control [Member] |  |
Revenues from external customers | 3,559 | 2,204
Air Pollution Control [Member] | Operating Segments [Member] |  |
Revenues from external customers | 3,559 | 2,204
Cost of sales | (2,594) | (1,429)
Gross margin | 965 | 775
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from operations | 965 | 775
FUEL CHEM [Member] | Operating Segments [Member] |  |
Revenues from external customers | 3,728 | 3,331
Cost of sales | (1,888) | (1,816)
Gross margin | 1,840 | 1,515
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from operations | $ 1,840 | $ 1,515

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