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Note 3 - Supplier Concentration (Details Textual) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | May 31, 2022 CAD ($) | Oct. 01, 2021 USD ($) | Sep. 14, 2021 USD ($)
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 20 |  |  |  |
RTC Canada Floor Plan Agreement [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 116.7 |  |  |
Revolving Credit Facility [Member] | RTC Canada [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 120.0 |  |
Line of Credit Facility, Additional Borrowing Capacity Upon Request |  |  |  |  |  | $ 20.0 |  |
BMO Harris Bank N.A. [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000 |  |  |  |  |  |  |
WF Lenders [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 175
PLC Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 300 |
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Sales of New Peterbilt Commercial Vehicles [Member] |  |  |  |  |  |  |  |
Concentration Risk, Percentage | 59.60% | 62.50% | 59.00% |  |  |  |  |

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