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Note 7 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Depreciation $ 37.5 $ 37.2 $ 21.9
Capital Expenditures Incurred but Not yet Paid, Addition 1.0    
Capitalized Computer Software, Gross 32.8 $ 30.5  
Software Development [Member]      
Capitalized Computer Software, Gross 5.1    
Capitalized Computer Software, Additions $ 2.4