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Note 2 - Revenue Recognition (Tables)
6 Months Ended
Mar. 31, 2025
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

March 31, 2025

  

March 31, 2024

  

March 31, 2025

  

March 31, 2024

 

Smart Water

 $9,472  $6,411  $16,760  $10,645 

Energy Solutions

  3,399   6,380   23,225   40,086 

Intelligent Industrial

  5,837   6,706   11,368   12,480 

Total

 $18,708  $19,497  $51,353  $63,211 
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

March 31, 2025

  

March 31, 2024

  

March 31, 2025

  

March 31, 2024

 

Asia (including Russian Federation)

 $1,811  $3,672  $19,868  $35,888 

Canada

  626   1,002   995   2,228 

Europe

  1,190   1,507   2,588   2,885 

Mexico

  811   204   2,092   370 

United States

  14,002   12,831   25,425   21,249 

Other

  268   281   385   591 

Total

 $18,708  $19,497  $51,353  $63,211