Note 2 - Business Segment Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Identifiable assets	$ 172,263	$ 201,100
Corporate and Eliminations [Member]
Identifiable assets	18,423	18,081
Lighting Segment [Member] | Operating Segments [Member]
Identifiable assets	118,819	142,105
Graphics Segment [Member] | Operating Segments [Member]
Identifiable assets	$ 35,021	$ 40,914