Note 2 - Business Segment Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net sales	$ 496,979	$ 455,120
Lighting Segment [Member]
Net sales	272,451	233,449
Display Solutions Segment [Member]
Net sales	224,528	221,671
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net sales	22,283	38,310
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Net sales	$ 274	$ 352