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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, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Gross profit $ 72,736 $ 61,348 $ 56,894 $ 61,776 $ 66,828 $ 58,638 $ 58,235 $ 68,552 $ 252,754 $ 252,253 $ 247,486
Net income $ 14,131 $ 7,660 $ 10,442 $ 14,344 $ 12,188 $ 11,516 $ 12,371 $ 15,981 $ 46,545 $ 52,056 $ 54,743
Basic (in dollars per share) $ 1.12 [1] $ 0.60 [1] $ 0.82 [1] $ 1.13 [1] $ 0.96 [1] $ 0.91 [1] $ 0.97 [1] $ 1.26 [1] $ 3.68 $ 4.11 $ 4.33
Diluted (in dollars per share) $ 1.11 [1] $ 0.60 [1] $ 0.82 [1] $ 1.12 [1] $ 0.95 [1] $ 0.91 [1] $ 0.96 [1] $ 1.25 [1] $ 3.65 $ 4.08 $ 4.27
Net sales $ 217,089 $ 184,715 $ 173,854 $ 179,600 $ 193,775 $ 177,465 $ 181,948 $ 198,398 $ 755,258 [2] $ 751,586 [2] $ 772,142 [2]
[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.
[2] Net sales were identified based on geographic location where our products and services were initiated.