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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Realized Gain (Loss), Foreign Currency Transaction, before Tax $ 2,000 $ 2,800 $ 4,200
Government Assistance, Nonoperating Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)  
Government Assistance, Nonoperating Income, Increase (Decrease) $ 700 $ 2,100  
Government Assistance Amount Advance Current 1,900 1,400  
Effective Income Tax Rate Reconciliation, Deduction, Worthless Stock, Amount 45,600 (0) (0)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions $ 2,500 $ 0 $ 0
Minimum [Member]      
Standard Payment Period (Year) 30 years    
Maximum [Member]      
Standard Payment Period (Year) 60 years    
Revenue Benchmark [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 0 0 0
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]      
Concentration Risk, Percentage 25.00% 20.00% 20.00%