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Note 18 - Unaudited Quarterly Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 357,830 $ 359,291 $ 288,360 $ 311,818 $ 403,997 $ 352,305 $ 362,609 $ 342,008 $ 1,317,299 $ 1,460,919 $ 1,485,765
Gross profit 131,124 130,326 95,897 102,603 138,410 130,283 128,012 119,514 459,950 516,219 569,560
Operating income 27,316 67,867 39,467 44,911 79,115 70,794 78,160 65,306 179,561 293,375 351,465
Net income $ 9,182 $ 34,036 $ 14,844 $ 19,685 $ 49,390 $ 36,497 $ 54,025 $ 34,701 $ 77,747 $ 174,613 $ 174,539
Net income per common share, basic: (in dollars per share) $ 0.14 $ 0.50 $ 0.22 $ 0.29 $ 0.72 $ 0.53 $ 0.79 $ 0.51 $ 1.14 $ 2.55 $ 2.56
Net income per common share, diluted: (in dollars per share) $ 0.14 $ 0.49 $ 0.21 $ 0.28 $ 0.70 $ 0.52 $ 0.77 $ 0.50 $ 1.12 $ 2.49 $ 2.51