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Note 8 - Long-term Debt (Details Textual) $ in Millions, $ in Millions | Dec. 22, 2023 USD ($) | Nov. 01, 2023 USD ($) | May 31, 2022 CAD ($) | Dec. 31, 2023 USD ($) | Oct. 01, 2021 USD ($) | Sep. 14, 2021 USD ($)
--- | --- | --- | --- | --- | --- | ---
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 20 |  |
Revolving Credit Facility [Member] | RTC Canada [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 120 |  |  |
Line of Credit Facility, Additional Borrowing Capacity Upon Request |  |  | $ 20 |  |  |
Revolving Credit Facility [Member] | CDOR [Member] | RTC Canada [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.35% |  |  |
WF Lenders [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 175 |  |  |  |  | $ 175
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 |  |  | $ 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 Amount of additional borrowing capacity on the line of credit facility upon request. + References No definition available. + Details
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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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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