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Note 18 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Net sales $ 142,308 $ 187,039 $ 190,585 $ 196,444 $ 209,199 $ 216,773 $ 219,498 $ 217,528 $ 604,535 [1] $ 639,931 [1] $ 595,515 [1]
Gross profit 46,550 58,108 66,453 68,283 70,081 68,199 75,569 77,050 215,455 234,667 225,999
Net income $ 1,835 $ (6,323) $ 12,237 $ 12,439 $ 12,390 $ 26,269 $ 13,398 $ 15,857 $ 20,188 $ 67,914 $ 36,604
Basic (in dollars per share) $ 0.15 [2] $ (0.51) [2] $ 0.99 [2] $ 1.01 [2] $ 1.00 [2] $ 2.09 [2] $ 1.06 [2] $ 1.25 [2] $ 1.64 $ 5.40 $ 2.88
Diluted (in dollars per share) $ 0.15 [2] $ (0.51) [2] $ 0.99 [2] $ 1.00 [2] $ 0.99 [2] $ 2.09 [2] $ 1.05 [2] $ 1.24 [2] $ 1.63 $ 5.38 $ 2.86
[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.