Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Identifiable assets	$ 255,916	$ 195,560
Corporate and Eliminations [Member]
Identifiable assets	7,884	38,554
Lighting Segment [Member]
Identifiable assets	187,147	95,168
Graphics Segment [Member]
Identifiable assets	32,151	33,490
Technology Segment [Member]
Identifiable assets	$ 28,734	$ 28,348

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