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Note 3 - Segment Reporting Information (Details) - Inter-segment Revenues - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | [1] | $ 85,925 | $ 78,466
Lighting Segment [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | 59,075 | 55,721
Lighting Segment [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | 614 | 1,052
Graphics Segment [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | 21,753 | 16,024
Graphics Segment [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | 444 | 131
Technology Segment [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | 5,097 | 6,680
Technology Segment [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  | $ 9,384 | 7,272
All Other Category [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  |  | 41
All Other Category [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales |  |  | $ 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=26872669&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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