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Note 11 - Business Segment and Geographic Financial Data (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

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)

Operating income (loss) from operations

 $425  $2,534  $(3,911) $(952)
  

Air Pollution

  

FUEL CHEM

         

Three months ended March 31, 2024

 

Control Segment

  

Segment

  

Other

  

Total

 

Revenues from external customers

 $2,318  $2,639  $  $4,957 

Cost of sales

  (1,428)  (1,500)     (2,928)

Gross margin

  890   1,139      2,029 

Selling, general and administrative

        (3,345)  (3,345)

Research and development

        (376)  (376)

Operating income (loss) from operations

 $890  $1,139  $(3,721) $(1,692)
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
  

Three Months Ended

 
  

March 31,

 
  

2025

  

2024

 

Revenues:

        

United States

 $5,359  $3,595 

Foreign

  1,023   1,362 
  $6,382  $4,957 
  

March 31,

  

December 31,

 
  

2025

  

2024

 

Assets:

        

United States

 $42,788  $44,430 

Foreign

  3,921   4,367 
  $46,709  $48,797