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Note 13 - Revenue From Contracts With Customers (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2025
Dec. 31, 2024
Accounts Receivable, after Allowance for Credit Loss, Current $ 142,181 $ 154,172   $ 146,870 $ 152,259
Contract with Customer, Asset, after Allowance for Credit Loss, Current 37,300 28,900      
Contract with Customer, Asset, Revenue Recognized 30,400 18,600      
Contract with Customer, Liability 34,500 30,500      
Contract with Customer, Liability, Revenue Recognized 18,400 27,800 $ 34,200    
Revenue, Remaining Performance Obligation, Amount $ 66,888        
Capitalized Contract Cost, Amortization Period (Month) 60 months        
Capitalized Contract Cost, Amortization $ 100 $ 400