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Note 15 - Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Discretionary contributions	$ 0	$ 0	$ 0
Employee deferrals	$ 3,597,000	4,306,000	3,615,000
Interest on deferred compensation, basis spread on variable rate	1.00%
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Prime Rate [Member]
Deferred compensation liability, current and noncurrent	$ 55,165,000	46,800,000	$ 38,255,000	$ 32,353,000
Percent of employee contributions matched	4.50%
Certain Executive Officers [Member]
Company matching contribution percent (as a percent)	100.00%
Minimum [Member]
Defined benefit plan eligible age limit	18 years
Minimum [Member] | Certain Executive Officers [Member]
Employee deferrals	$ 10,000
Interest on deferred compensation amounts	4.00%
Maximum [Member] | Certain Executive Officers [Member]
Employee deferrals	$ 25,000
Interest on deferred compensation amounts	12.00%
Certain Management Officers [Member]
Company matching contribution percent (as a percent)	50.00%
Number of monthly installment payments	180 months
Deferred compensation liability, current and noncurrent	$ 55,100,000	$ 46,800,000
Certain Management Officers [Member] | Minimum [Member]
Company matching contribution percent (as a percent)	4.00%
Interest on deferred compensation amounts	4.00%
Certain Management Officers [Member] | Maximum [Member]
Company matching contribution percent (as a percent)	12.00%
Interest on deferred compensation amounts	8.00%
First 3% of Employees Wages [Member]
Company matching contribution percent (as a percent)	100.00%
Match at 100% [Member]
Percent of employee contributions matched	3.00%
From 4% to 4.5% of Employees Wages [Member]
Company matching contribution percent (as a percent)	50.00%
Matched at 50% [Member]
Percent of employee contributions matched	3.00%

X

- Definition

The eligible age limit of employee for participation in the defined benefit plan.

+ References

No definition available.

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- Definition

The amount of discretionary contributions made by the entity.

+ References

No definition available.

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- Definition

Interest on deferred compensation amounts.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

The number of monthly installment payments.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

Indicates type of variable interest rate of investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

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