Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Warranty claims	$ 9,032	$ 16,819
Other accounts receivable	24,027	16,942
Less allowance for credit losses	(1,605)	(1,424)
Total	172,481	183,704
Trade Accounts Receivable From Sale of Vehicles [Member]
Trade receivables	82,338	82,991
Trade Receivable Other Than Vehicles [Member]
Trade receivables	$ 58,689	$ 68,376