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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenues from external customers | $ 6,368 | $ 5,218 | $ 11,903 | $ 10,251
Cost of sales | (3,690) | (2,635) | (6,935) | (5,310)
Gross margin | 2,678 | 2,583 | 4,968 | 4,941
Selling, general and administrative | (2,874) | (2,957) | (5,928) | (6,057)
Research and development | (289) | (315) | (509) | (730)
Operating income (loss) from operations | (485) | (689) | (1,469) | (1,846)
Air Pollution Control [Member] |  |  |  |
Revenues from external customers | 2,738 | 986 | 4,942 | 1,893
Cost of sales | (1,802) | (507) | (3,231) | (1,038)
Gross margin | 936 | 479 | 1,711 | 855
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 936 | 479 | 1,711 | 855
FUEL CHEM [Member] |  |  |  |
Revenues from external customers | 3,630 | 4,232 | 6,961 | 8,358
Cost of sales | (1,888) | (2,128) | (3,704) | (4,272)
Gross margin | 1,742 | 2,104 | 3,257 | 4,086
Selling, general and administrative | 0 | 0 | 0 | 0
Research and development | 0 | 0 | 0 | 0
Operating income (loss) from operations | 1,742 | 2,104 | 3,257 | 4,086
Other Segments [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 | (2,874) | (2,957) | (5,928) | (6,057)
Research and development | (289) | (315) | (509) | (730)
Operating income (loss) from operations | $ (3,163) | $ (3,272) | $ (6,437) | $ (6,787)

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