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Note 20 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Net Sales $ 193,775 $ 177,465 $ 181,948 $ 198,398 $ 199,779 $ 180,999 $ 189,337 $ 202,027 $ 751,586 $ 772,142 $ 716,180
Gross profit 66,828 58,638 58,235 68,552 65,316 57,258 58,800 66,112 252,253 247,486 238,269
Net income (loss) $ 12,188 $ 11,516 $ 12,371 $ 15,981 $ 16,381 $ 12,626 $ 11,184 $ 14,552 $ 52,056 $ 54,743 $ 42,866
Basic (in dollars per share) $ 0.96 [1] $ 0.91 [1] $ 0.97 [1] $ 1.26 [1] $ 1.30 [1] $ 1 [1] $ 0.88 [1] $ 1.15 [1] $ 4.11 $ 4.33 $ 3.39
Diluted (in dollars per share) $ 0.95 [1] $ 0.91 [1] $ 0.96 [1] $ 1.25 [1] $ 1.28 [1] $ 0.99 [1] $ 0.87 [1] $ 1.13 [1] $ 4.08 $ 4.27 $ 3.35
[1] Basic and diluted earnings per share are computed independently for each reporting period. Accordingly, the sum of the quarterly earnings per share amounts may not agree to the year-to-date amounts.