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Note 18 - Summary of Quarterly Results (Unaudited) - Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | 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, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Net sales | $ 83,409 | $ 78,843 | $ 92,305 | $ 87,466 | $ 83,419 | $ 78,156 | $ 85,658 | $ 84,159 | $ 80,844 | $ 70,740 | $ 84,687 | $ 85,925 | $ 342,023 | $ 331,392 | $ 322,196 |  | $ 307,857 | $ 299,463
Gross profit | 20,306 | 19,918 | 25,307 | 23,703 | 21,236 | 18,399 | 21,407 | 20,835 | 19,847 | 16,549 | 23,926 | 23,349 | 89,234 | 81,877 | 83,671 |  |  |
Net income (loss) | $ (2,664) | $ 220 | $ (1,468) | $ (15,629) | $ 696 | $ (531) | $ 2,006 | $ 829 | $ 1,428 | $ 522 | $ 3,782 | $ 3,750 | $ (19,541) | $ 3,000 | $ 9,482 |  | $ 5,151 | $ 930
Basic (in dollars per share) | $ (0.10) | $ (0.01) | $ (0.06) | $ (0.61) | $ 0.03 | $ (0.02) | $ 0.08 | $ 0.03 | $ 0.06 | $ 0.02 | $ 0.15 | $ 0.15 | $ (0.76) | $ 0.12 | $ 0.38 |  | $ 0.21 | $ 0.04
Diluted (in dollars per share) | (0.10) | (0.01) | (0.06) | (0.61) | 0.03 | (0.02) | 0.08 | 0.03 | 0.06 | 0.02 | 0.15 | 0.15 | $ (0.76) | $ 0.12 | $ 0.37 |  | $ 0.21 | $ 0.04
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share prices (in dollars per share) | 8.11 | 8.88 | 7.49 | 9.27 | 10.21 | 10.68 | 11.23 | 11.64 | 13.45 | 12.22 | 12.80 | 10.48 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share prices (in dollars per share) | $ 4.91 | $ 6.70 | $ 6.07 | $ 4.99 | $ 8.26 | $ 8.31 | $ 8.12 | $ 9.41 | $ 10.29 | $ 9.85 | $ 7.89 | $ 8.33 |  |  |  |  |  |
Fiscal Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 342,023 | $ 331,392 | $ 322,196 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | 89,234 | 81,877 | 83,671 |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ (19,541) | $ 3,000 | $ 9,482 |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.76) | $ 0.12 | $ 0.38 |  |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | (0.76) | 0.12 | 0.37 | [1] |  |
Fiscal Year [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share prices (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 9.27 | 11.64 | 13.45 |  |  |
Fiscal Year [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share prices (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.91 | $ 8.12 | $ 7.89 |  |  |
[1] | The total of the earnings per share for each of the four quarters does not equal the total earnings per share for the full year because the calculations are based on the average shares outstanding during each of the individual periods.

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