Note 3 - Segment Reporting Information - Identifiable Assets by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Total Assets	$ 301,768	$ 296,149
Corporate and Eliminations [Member]
Total Assets	7,377	7,901
Lighting Segment [Member] | Operating Segments [Member]
Total Assets	145,085	142,941
Display Solutions Segment [Member] | Operating Segments [Member]
Total Assets	$ 149,306	$ 145,307