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Note 6 - Financing Arrangements (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total		$ 17,400	$ 0	$ 0
Credit Facility [Member]
Long-Term Line of Credit, Total	$ 5,000
Revolving Credit Facility [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Long-Term Line of Credit, Total		17,000
Letter of Credit [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	15,000
Swing Line Subfacility [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	20,000
Line of Credit Maturing February 2024 [Member]
Letters of Credit Outstanding, Amount	20,000
Line of Credit Maturing May 2024 [Member]
Letters of Credit Outstanding, Amount	6,500
Bank Guarantee [Member]
Letters of Credit Outstanding, Amount	3,000
Senior Term Loan Facility [Member]
Debt Instrument, Face Amount	$ 350,000
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	4.50
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio	1.20
Debt Issuance Costs, Net, Total		$ 12,800
Senior Term Loan Facility [Member] | Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Senior Term Loan Facility [Member] | Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
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		2.50%
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	1.75%
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	2.75%
Senior Secured Credit Agreement for Periods Ending June 30, 2023 and September 30, 2023 [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	4.00
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	5.25
Senior Secured Credit Agreement for Periods Ending December 31, 2023 and After [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	3.50
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	4.75
Senior Secured Credit Agreement for Periods Ending June30, September 30, December 31, 2022 and March 31, 2023 [Member]
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	5.75
Subordinated Credit Facility [Member]
Debt Instrument, Face Amount	$ 90,000
Subordinated Credit Facility [Member] | Minimum [Member]
Debt Instrument, Prepayment Fee, Percent	1.00%
Subordinated Credit Facility [Member] | Maximum [Member]
Debt Instrument, Prepayment Fee, Percent	2.00%
Subordinated Credit Facility [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	8.00%
Subordinated Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	9.00%	9.10%
Subordinated Credit Agreement for Periods Ending June30, September 30, December 31, 2022 and March 31, 2023 [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	5.40
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	6.90
Subordinated Credit Agreement for Periods Ending June 30, 2023 and September 30, 2023 [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	4.80
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	6.30
Subordinated Credit Agreement for Periods Ending December 31, 2023 and After [Member]
Debt Instrument, Covenant, Maximum Senior Secured Net Leverage Ratio	4.20
Debt Instrument, Covenant, Maximum Total Net Leverage Ratio	5.70
Senior Secured Credit Agreement and Subordinated Credit Agreement [Member]
Debt Issuance Costs, Net, Total		$ 15,200
Credit Facility [Member]
Debt Issuance Costs, Net, Total		$ 2,400

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