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Note 6 - Debt and Other Financing Arrangements (Details Textual) - Credit Agreement [Member] - USD ($) $ in Millions	Sep. 30, 2021	Aug. 01, 2018
Long-term Debt, Total	$ 300.2
Term Loan [Member]
Debt Instrument, Face Amount		$ 250.0
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		600.0
Line of Credit Facility, Additional Borrowing Capacity		$ 200.0

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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