Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 109,005	$ 128,804	$ 232,446	$ 255,873
Lighting Segment [Member]
Net sales	64,795	66,833	132,436	134,366
Display Solutions Segment [Member]
Net sales	44,210	61,971	100,010	121,507
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net sales	5,286	5,067	12,150	11,210
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Net sales	$ (15)	$ 30	$ 440	$ 36