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Note 3 - Revenue (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2025

  

2024

  

2025

  

2024

 

Air Pollution Control

                

Technology solutions

 $1,227  $2,554  $3,443  $6,837 

Spare parts

  840   424   1,516   1,428 

Ancillary revenue

  640   246   1,556   1,226 

Total Air Pollution Control technology revenues

  2,707   3,224   6,515   9,491 

FUEL CHEM

                

FUEL CHEM technology solutions

  4,783   4,627   12,915   10,359 

Total Revenues

 $7,490  $7,851  $19,430  $19,850 
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2025

  

2024

  

2025

  

2024

 

United States

 $5,626  $5,453  $15,427  $13,519 

Foreign Revenues

                

Latin America

  166   208   579   816 

Europe

  698   785   1,882   1,627 

Africa

  68   741   262   2,443 

Asia

  932   664   1,280   1,445 

Total Foreign Revenues

  1,864   2,398   4,003   6,331 

Total Revenues

 $7,490  $7,851  $19,430  $19,850 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2025

  

2024

  

2025

  

2024

 

Products transferred at a point in time

 $6,263  $5,297  $15,987  $13,013 

Products and services transferred over time

  1,227   2,554   3,443   6,837 

Total Revenues

 $7,490  $7,851  $19,430  $19,850 
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

As of

 
  

September 30, 2025

  

December 31, 2024

 

Trade receivables

 $3,315  $5,375 

Unbilled receivables

  1,300   2,075 

Receivable for employee retention credit

     1,677 

Other short-term receivables

  321   347 

Allowance for credit losses

  (108)  (106)

Total accounts receivable

 $4,828  $9,368