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Note 3 - Supplier Concentration (Details Textual) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 01, 2021 | Sep. 14, 2021
Line of Credit Facility, Maximum Borrowing Capacity | $ 15 |  |  |  |
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 |  |  |  |  | $ 250
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 | 62.50% | 59.00% | 61.60% |  |

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