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Note 12 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Revenues from external customers | $ 26,941 | $ 24,261
Cost of sales | (15,298) | (12,363)
Gross margin | 11,643 | 11,898
Selling, general and administrative | (12,275) | (12,055)
Research and development | (895) | (1,332)
Operating income (loss) from continuing operations | (1,527) | (1,489)
Air Pollution Control [Member] |  |
Revenues from external customers | 10,597 | 6,896
Cost of sales | (6,924) | (3,529)
Gross margin | 3,673 | 3,367
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from continuing operations | 3,673 | 3,367
FUEL CHEM [Member] |  |
Revenues from external customers | 16,344 | 17,365
Cost of sales | (8,374) | (8,834)
Gross margin | 7,970 | 8,531
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from continuing operations | 7,970 | 8,531
Other Segments [Member] |  |
Revenues from external customers | 0 | 0
Cost of sales | 0 | 0
Gross margin | 0 | 0
Selling, general and administrative | (12,275) | (12,055)
Research and development | (895) | (1,332)
Operating income (loss) from continuing operations | $ (13,170) | $ (13,387)

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