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Note 7 - Debt, Credit Agreement and Leases (Details Textual) - USD ($) $ in Millions |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 21, 2022 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | May 03, 2024
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, commitment fee percentage |  | 6.70% |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  | $ 6.7 |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, commitment fee percentage | 0.45% |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |  |
Debt instrument, basis spread on variable rate, applicable margin | 1.00% |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Leverage Ratio Applicable Margin [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, participation fee, percent | 2.00% |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 225.0
Line of credit facility, commitment fee percentage | 0.7875% |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.50% |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.50% |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Leverage Ratio Applicable Margin [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, participation fee, percent | 3.50% |  |  |  |
New Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit, drawn amount |  | $ 39.0 |  |  |
Senior Notes [Member] | New Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit, drawn amount |  |  | $ 225.0 |  |
Senior Notes [Member] | IQ Notes [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 7.25% | 7.25% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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