Note 6 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2023
Goodwill	$ 133,076	$ 134,318
Measurement period adjustment	1,242
Accumulated impairment losses	(89,288)	(89,288)
Goodwill	45,030	45,030
Lighting Segment [Member]
Goodwill	70,971	70,971
Measurement period adjustment	0
Accumulated impairment losses	(61,763)	(61,763)
Goodwill	9,208	9,208
Display Solutions Segment [Member]
Goodwill	62,105	63,347
Measurement period adjustment	1,242
Accumulated impairment losses	(27,525)	(27,525)
Goodwill	$ 35,822	$ 35,822