Note 18 - Revenue - Disaggregated Revenue by Revenue Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue	$ 4,499,717	$ 5,562,298	$ 5,267,952
Commercial Vehicle [Member]
Revenue	2,863,309	3,757,584	3,558,637
Parts [Member]
Revenue	911,102	993,288	937,241
Commercial Vehicle Repair Service [Member]
Revenue	689,343	769,222	732,811
Financial Service [Member]
Revenue	12,047	14,618	10,795
Insurance [Member]
Revenue	9,902	9,825	9,740
Product and Service, Other [Member]
Revenue	$ 14,014	$ 17,761	$ 18,728