Note 8 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
Goodwill	$ 146,744	$ 146,685
Accumulated impairment losses	(89,288)	(89,288)
Goodwill	57,456	57,397
Lighting Segment [Member]
Goodwill	70,971	70,971
Accumulated impairment losses	(61,763)	(61,763)
Goodwill	9,208	9,208
Display Solutions Segment [Member]
Goodwill	75,773	75,714
Accumulated impairment losses	(27,525)	(27,525)
Goodwill	$ 48,248	$ 48,189