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Note 19 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Net sales $ 209,206 $ 193,771 $ 195,522 $ 193,080 $ 203,469 $ 192,147 $ 185,694 $ 189,142 $ 791,579 [1] $ 770,452 [1] $ 647,885 [1]
Gross profit 70,082 61,790 66,936 69,252 74,502 66,112 63,317 65,671 268,060 269,602 215,553
Net income $ 12,390 $ 26,269 $ 13,398 $ 15,857 $ 12,612 $ 12,800 $ (2,806) $ 13,998 $ 67,914 $ 36,604 $ 46,545
Basic (in dollars per share) $ 1 [2] $ 2.09 [2] $ 1.06 [2] $ 1.25 [2] $ 0.99 [2] $ 1.01 [2] $ (0.22) [2] $ 1.10 [2] $ 5.40 $ 2.88 $ 3.68
Diluted (in dollars per share) $ 0.99 [2] $ 2.09 [2] $ 1.05 [2] $ 1.24 [2] $ 0.99 [2] $ 1 [2] $ (0.22) [2] $ 1.09 [2] $ 5.38 $ 2.86 $ 3.65
[1] Net sales were identified based on geographic location where our products and services were initiated.
[2] 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.