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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
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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.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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