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%