Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Identifiable assets	$ 181,795	$ 172,263
Segment Reconciling Items [Member]
Identifiable assets	25,464	18,423
Lighting Segment [Member] | Operating Segments [Member]
Identifiable assets	120,449	118,819
Graphics Segment [Member] | Operating Segments [Member]
Identifiable assets	$ 35,882	$ 35,021