v3.26.1
Note 11 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenues from external customers $ 6,080 $ 6,382
Cost of sales (3,436) (3,423)
Gross margin 2,644 2,959
Selling, general and administrative (3,716) (3,341)
Research and development (524) (570)
Income (loss) from operations (1,596) (952)
Air Pollution Control [Member]    
Revenues from external customers 1,604 1,303
Cost of sales (989) (878)
Gross margin 615 425
Selling, general and administrative 0 0
Research and development 0 0
Income (loss) from operations 615 425
FUEL CHEM [Member]    
Revenues from external customers 4,476 5,079
Cost of sales (2,447) (2,545)
Gross margin 2,029 2,534
Selling, general and administrative 0 0
Research and development 0 0
Income (loss) from operations 2,029 2,534
Other Operating Segment [Member]    
Revenues from external customers 0 0
Cost of sales 0 0
Gross margin 0 0
Selling, general and administrative (3,716) (3,341)
Research and development (524) (570)
Income (loss) from operations $ (4,240) $ (3,911)