Note 8 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025
Goodwill	$ 153,836	$ 146,685
Measurement period adjustments	(262)
Foreign currency translation	(218)	382
Accumulated impairment losses	(89,288)	(89,288)
Goodwill	64,068	64,548
Goodwill acquired, net of adjustments		6,769
Lighting Segment [Member]
Goodwill	70,971	70,971
Measurement period adjustments	0
Foreign currency translation	0	0
Accumulated impairment losses	(61,763)	(61,763)
Goodwill	9,208	9,208
Goodwill acquired, net of adjustments		0
Display Solutions Segment [Member]
Goodwill	82,865	75,714
Measurement period adjustments	(262)
Foreign currency translation	(218)	382
Accumulated impairment losses	(27,525)	(27,525)
Goodwill	$ 54,860	55,340
Goodwill acquired, net of adjustments		$ 6,769