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Note 9 - Pensions and Other Postretirement Benefits (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.10%	5.00%
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ 6,400
Unrecognized Actuarial Gain (Loss) in Excess of Benefit Obligation, Percentage	10.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 2,900
One Percentage Point Change in Assumed Rate of Return [Member]
Defined Benefit Plan Effect On Pension Expense			500
One Percentage Point Increase in Discount Rate [Member]
Defined Benefit Plan Effect On Pension Expense		$ 1,200
One Percentage Point Decrease in Discount Rate [Member]
Defined Benefit Plan Effect On Pension Expense		1,500
Defined Benefit Plan, Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5.00%
Defined Benefit Plan, Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%
Fixed Income Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	49.00%
Fixed Income Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	70.00%
Alternative Investments [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	13.00%
Alternative Investments [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Pension Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4,800	4,300	3,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ (0)	$ (0)	$ (6,427)
Postretirement Health Coverage [Member]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.10%

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+ References

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

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