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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, 2021 | Dec. 31, 2020
Revenues from external customers | $ 24,261 | $ 22,550
Cost of sales | (12,363) | (11,912)
Gross margin | 11,898 | 10,638
Selling, general and administrative | (12,055) | (13,600)
Research and development | (1,332) | (1,177)
Operating income (loss) from continuing operations | (1,489) | (4,336)
Intangible assets abandonment | 0 | (197)
Air Pollution Control [Member] |  |
Revenues from external customers | 6,896 | 8,557
Cost of sales | (3,529) | (4,583)
Gross margin | 3,367 | 3,974
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from continuing operations | 3,367 | 3,974
Intangible assets abandonment |  | 0
FUEL CHEM [Member] |  |
Revenues from external customers | 17,365 | 13,993
Cost of sales | (8,834) | (7,329)
Gross margin | 8,531 | 6,664
Selling, general and administrative | 0 | 0
Research and development | 0 | 0
Operating income (loss) from continuing operations | 8,531 | 6,664
Intangible assets abandonment |  | 0
Other Segments [Member] |  |
Revenues from external customers | 0 | 0
Cost of sales | 0 | 0
Gross margin | 0 | 0
Selling, general and administrative | (12,055) | (13,600)
Research and development | (1,332) | (1,177)
Operating income (loss) from continuing operations | $ (13,387) | (14,974)
Intangible assets abandonment |  | $ (197)

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