Note 8 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Class of Treasury Stock [Table Text Block]

Year Ended December 31,	2015		2014		2013
Shares repurchased pursuant to repurchase plan		228,737		226,729		127,900
Total purchase price (in thousands)	$	24,676	$	15,990	$	5,213
Average purchase price per share	$	107.88	$	70.52	$	40.76
Shares repurchased in association with tax withholdings on the exercise of stock options		77,649		106,772		59,721

Dividends Declared [Table Text Block]

Quarter declared	Dividend amount per Class A and Class B share		Total amount of dividend (in thousands)
2013
First quarter (1)	$	—	$	—
Second quarter		0.13		3,356
Third quarter		0.13		3,363
Fourth quarter		0.13		3,366
2014
First quarter	$	0.13	$	3,378
Second quarter		0.16		4,179
Third quarter		0.16		4,174
Fourth quarter		0.16		4,198
2015
First quarter	$	0.16	$	4,216
Second quarter		0.20		5,266
Third quarter		0.20		5,257
Fourth quarter		0.20		5,246

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Year Ended December 31,	2015			2014			2013			Affected Line Item in the Consolidated Statement of Operations
Loss on cash flow hedges	$	(449	)	$	(488	)	$	(740	)	Floor plan interest expense
Income tax benefits		174			187			283		Income tax provision
Loss on cash flow hedges, net	$	(275	)	$	(301	)	$	(457	)