Note 9 - Leases - Summary of Rental Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total rental expense	$ 24,091	$ 25,965
Revenue Equipment [Member]
Total rental expense	20,114	22,505
Land and Building [Member]
Total rental expense	3,651	2,982
Other Machinery and Equipment [Member]
Total rental expense	$ 326	$ 478