Note 2 - Business Segment Information (Details) - Identifiable Assets by Segment - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Identifiable Assets:
Identifiable Assets	$ 182,379	$ 169,888	$ 169,179	$ 175,226	$ 176,021
Corporate and Eliminations [Member]
Identifiable Assets:
Identifiable Assets	33,766	15,316
Lighting Segment [Member]
Identifiable Assets:
Identifiable Assets	90,713	93,847
Graphics Segment [Member]
Identifiable Assets:
Identifiable Assets	29,477	24,425
Technology Segment [Member]
Identifiable Assets:
Identifiable Assets	$ 28,423	33,440
All Other Category [Member]
Identifiable Assets:
Identifiable Assets		$ 2,860