Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Warranty claims	$ 8,095	$ 8,261
Other accounts receivable	22,409	28,810
Less allowance for bad debt and warranty claims	(663)	(611)
Total	156,199	156,977
Trade Accounts Receivable From Sale of Vehicles [Member]
Trade receivables	83,482	76,601
Trade Receivable Other Than Vehicles [Member]
Trade receivables	$ 42,876	$ 43,916