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Note 2 - Business Segment Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
--- | --- | --- | --- | --- | ---
Identifiable Assets: |  |  |  |  |
Identifiable assets | $ 229,517 | $ 256,680 | $ 195,560 | $ 180,690 | $ 168,688
Corporate and Eliminations [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable assets | 16,837 | 9,466 |  |  |
Lighting Segment [Member] | Operating Segments [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable assets | 172,799 | 214,070 |  |  |
Graphics Segment [Member] | Operating Segments [Member] |  |  |  |  |
Identifiable Assets: |  |  |  |  |
Identifiable assets | $ 39,881 | $ 33,144 |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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