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Note 5 - Financing Arrangements (Details Textual) $ in Millions			12 Months Ended
	May 31, 2024 USD ($)	May 31, 2022	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total			$ 33.6	$ 35.9	$ 17.4
Interest Rate Swap [Member]
Derivative Liability			$ 0.1	$ 1.4
Revolving Credit Facility [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100.0
Letter of Credit [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	30.0
Swing Line Subfacility [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	20.0
Senior Term Loan Facility [Member]
Debt Instrument, Face Amount	$ 370.0
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio		4.5
Senior Term Loan Facility [Member] | Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Senior Term Loan Facility [Member] | Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Senior Term Loan Facility [Member] | Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			2.00%
Senior Term Loan Facility [Member] | Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Senior Term Loan Facility [Member] | Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Senior Secured Credit Agreement for Periods Ending June 30, 2023 and September 30, 2023 [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio		4.25
Senior Secured Credit Agreement for Periods Ending December 31, 2023 and After [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio		4
Senior Term Loan Facility for Period Ending December 31, 2025 and Thereafter [Member]
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	0.00035
Senior Term Loan Facility for Consecutive Quarter Periods [Member]
Debt Instrument Covenant Minimum Interest Coverage Ratio	0.0003
6.40% Note Agreement [Member]
Debt Instrument, Face Amount			$ 30.0
Subordinated Credit Facility [Member]
Cash Payment			10.0
Repayments of Subordinated Debt			91.8
Make-whole Payment of Debt			1.8
Subordinated Credit Facility and Senior Term Loan Facility [Member]
Debt Instrument, Transaction Fees			1.3
Write Off of Unamortized Deferred Transaction Fees			4.4
Senior Secured Credit Agreement and Subordinated Credit Agreement [Member]
Debt Issuance Costs, Net			$ 0.7

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