Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Identifiable assets	$ 291,019	$ 311,080
Corporate and Eliminations [Member]
Identifiable assets	7,697	6,347
Lighting Segment [Member] | Operating Segments [Member]
Identifiable assets	142,656	152,431
Display Solutions Segment [Member] | Operating Segments [Member]
Identifiable assets	$ 140,666	$ 152,302