Note 1 - Advertising Expense and Manufacturing Cooperative Advertising Credits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Advertising expense, gross	$ 89,736	$ 62,933	$ 51,404
Manufacturer cooperative advertising credits	(19,801)	(16,281)	(11,806)
Advertising expense, net	$ 69,935	$ 46,652	$ 39,598