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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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