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Note 8 - Long-term Debt (Details Textual) - USD ($) $ in Millions | Oct. 01, 2021 | Sep. 14, 2021 | Dec. 31, 2021
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Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 15
WF Lenders [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 250 |
WF Lenders [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |
WF Lenders [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |
PLC Agreement [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300 |  |
PLC Agreement [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.55% |  |
PLC Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.00% |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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