v3.26.1
Note 11 - Business Segment and Geographic Financial Data (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Segment Reporting [Table Text Block]
  

Air Pollution

  

FUEL CHEM

         

Three months ended March 31, 2026

 

Control Segment

  

Segment

  

Other

  

Total

 

Revenues from external customers

 $1,604  $4,476  $  $6,080 

Cost of sales

  (989)  (2,447)     (3,436)

Gross margin

  615   2,029      2,644 

Selling, general and administrative

        (3,716)  (3,716)

Research and development

        (524)  (524)

Income (loss) from operations

 $615  $2,029  $(4,240) $(1,596)
  

Air Pollution

  

FUEL CHEM

         

Three months ended March 31, 2025

 

Control Segment

  

Segment

  

Other

  

Total

 

Revenues from external customers

 $1,303  $5,079  $  $6,382 

Cost of sales

  (878)  (2,545)     (3,423)

Gross margin

  425   2,534      2,959 

Selling, general and administrative

        (3,341)  (3,341)

Research and development

        (570)  (570)

Income (loss) from operations

 $425  $2,534  $(3,911) $(952)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2026

  

2025

 

Revenues:

        

United States

 $5,247  $5,359 

Foreign

  833   1,023 
  $6,080  $6,382 
  

March 31,

  

December 31,

 
  

2026

  

2025

 

Assets:

        

United States

 $41,751  $44,345 

Foreign

  2,736   2,834 
  $44,487  $47,179