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Note 17 - Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2013

Revenues		$	756,788			$	789,674			$	913,064			$	925,179
Gross profit			133,788				137,688				150,312				150,226
Operating income			24,613				11,789				27,870				27,482
Income before income taxes			22,100				9,309				25,089				24,563
Net income		$	13,547			$	5,632			$	15,179			$	14,859

Earnings per share:
Basic		$	0.35			$	0.14			$	0.38			$	0.38
Diluted		$	0.34			$	0.14			$	0.37			$	0.37

2012

Revenues		$	777,329			$	835,844			$	745,133			$	732,261
Gross profit			128,260				129,636				125,171				117,700
Operating income			29,380				31,966				27,627				25,227
Income before income taxes			26,076				28,559				24,244				22,304
Net income		$	15,906			$	17,422			$	14,909			$	14,218

Earnings per share:
Basic		$	0.41			$	0.45			$	0.38			$	0.37
Diluted		$	0.40			$	0.44			$	0.38			$	0.36