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Note 13 - Revenue From Contracts with Customers (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Accounts Receivable, after Allowance for Credit Loss, Current $ 172,711 $ 156,535  
Contract with Customer, Asset, after Allowance for Credit Loss, Current 29,200 24,200  
Contract with Customer, Asset, Revenue Recognized 15,800 18,800  
Contract with Customer, Liability 32,000 34,600 $ 39,700
Contract with Customer, Liability, Revenue Recognized 27,800 34,900  
Revenue, Remaining Performance Obligation, Amount $ 121,711    
Capitalized Contract Cost, Amortization Period (Year) 60 years    
Capitalized Contract Cost, Amortization $ 400 $ 500