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Note 3 - Revenue - Revenues Disaggregated by Product Technology (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues $ 7,042 $ 5,461 $ 11,999 $ 12,748
Air Pollution Control [Member]        
Revenues 3,949 3,422 6,267 6,981
Air Pollution Control [Member] | Technology Solutions [Member]        
Revenues 2,619 2,557 4,283 5,539
Air Pollution Control [Member] | Spare Parts [Member]        
Revenues 805 425 1,004 599
Air Pollution Control [Member] | Ancillary Revenue [Member]        
Revenues 525 440 980 843
FUEL CHEM [Member]        
Revenues 3,093 2,039 5,732 5,767
FUEL CHEM [Member] | Technology Solutions [Member]        
Revenues $ 3,093 $ 2,039 $ 5,732 $ 5,767