Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Warranty claims	$ 16,819	$ 10,427
Other accounts receivable	16,942	20,910
Less allowance for bad debt and warranty claims	(1,424)	(1,416)
Total	183,704	190,650
Trade Accounts Receivable From Sale of Vehicles [Member]
Trade receivables	82,991	100,013
Trade Receivable Other Than Vehicles [Member]
Trade receivables	$ 68,376	$ 60,716