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Note 2 - Business Segment Information - Intersegment Revenues (Details) - USD ($) $ 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, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Inter-segment Revenues | $ 83,419 | $ 78,156 | $ 85,658 | $ 84,159 | $ 80,844 | $ 70,740 | $ 84,687 | $ 85,925 | $ 76,073 | $ 68,603 | $ 84,715 | $ 78,466 | $ 331,392 | [1] | $ 322,196 | [1] | $ 307,857 | [1] | $ 299,463 | $ 280,790
Lighting Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 239,005 |  | 226,889 |  | 219,920 |  |  |
Graphics Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 72,395 |  | 77,968 |  | 67,152 |  |  |
Technology Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 19,992 |  | 17,339 |  | 20,744 |  |  |
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41 |  |  |
Intersegment Eliminations [Member] | Lighting Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 2,559 |  | 2,935 |  | 2,752 |  |  |
Intersegment Eliminations [Member] | Graphics Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 1,135 |  | 1,760 |  | 559 |  |  |
Intersegment Eliminations [Member] | Technology Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 33,981 |  | 35,733 |  | 29,412 |  |  |
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 308 |  |  |
[1] | Net sales are attributed to geographic areas based upon the location of the operation making the sale.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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