Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Identifiable assets	$ 238,374	$ 256,680
Corporate and Eliminations [Member]
Identifiable assets	16,300	9,466
Lighting Segment [Member] \| Operating Segments [Member]
Identifiable assets	182,680	214,070
Graphics Segment [Member] \| Operating Segments [Member]
Identifiable assets	$ 39,394	$ 33,144

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant