Note 13 - Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Schedule of Quarterly Financial Information [Table Text Block]

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Year ended December 31, 2011:
Revenues	$	210,587	$	224,985	$	246,218	$	256,795
Gross profit		41,174		45,840		52,629		63,481
Operating income		5,489		7,840		9,498		21,710
Net income		3,006		7,629		1,160		14,752
Basic earnings per share:
Net income	$	0.08	$	0.19	$	0.03	$	0.37
Diluted earnings per share
Net income	$	0.08	$	0.19	$	0.03	$	0.37

Year ended December 31, 2010:
Revenues	$	199,182		$	230,192		$	239,585		$	246,016
Gross profit		48,680			59,199			61,419			60,282
Operating income		12,506			22,747			26,955			24,827
Income from continuing operations		8,510			15,805			18,826			17,421
Loss from discontinued operations		(49	)		(28	)		(16	)		(7	)
Net income		8,461			15,777			18,810			17,414
Basic earnings per share:
Income from continuing operations	$	0.22		$	0.40		$	0.48		$	0.44
Loss from discontinued operations		(0.00	)		(0.00	)		(0.00	)		(0.00	)
Net income	$	0.22		$	0.40		$	0.48		$	0.44
Diluted earnings per share
Income from continuing operations	$	0.22		$	0.40		$	0.48		$	0.44
Loss from discontinued operations		(0.00	)		(0.00	)		(0.00	)		(0.00	)
Net income	$	0.22		$	0.40		$	0.48		$	0.44