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Note 8 - Supplementary Balance Sheet Information (Tables)
3 Months Ended
Dec. 31, 2025
Notes Tables  
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
  

Three Months Ended December 31,

 
  

2025

  

2024

 

Balance at beginning of period

 $4,649  $5,349 

Provisions

  536   1,041 

Payments received

  (1,103)  (991)

Write-offs and adjustments

  (29)  (217)

Balance at end of period

 $4,053  $5,182 
Schedule of Inventory, Current [Table Text Block]
  

December 31,

  

September 30,

 
  

2025

  

2025

 
       

Raw materials and purchased parts

 $38,861  $33,319 

Work-in-process

  6,179   5,050 

Finished goods

  37,418   36,587 

Total inventories

 $82,458  $74,956 
Schedule of Product Warranty Liability [Table Text Block]
  

Three Months Ended December 31,

 
  

2025

  

2024

 
       

Balance at beginning of period

 $4,713  $5,213 

Accruals for warranties during the period

  198   187 

Costs incurred during the period

  (596)  (427)

Balance at end of period

 $4,315  $4,973