Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Goodwill	$ 134,318	$ 134,318
Accumulated impairment losses	(89,288)	(89,288)
Goodwill, net as of March 31, 2023	45,030	45,030
Lighting Segment [Member]
Goodwill	70,971	70,971
Accumulated impairment losses	(61,763)	(61,763)
Goodwill, net as of March 31, 2023	9,208	9,208
Display Solutions Segment [Member]
Goodwill	63,347	63,347
Accumulated impairment losses	(27,525)	(27,525)
Goodwill, net as of March 31, 2023	$ 35,822	$ 35,822