Note 3 - Business Segment Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 455,120	$ 315,612
Operating income (loss)	21,201	8,030
Capital expenditures	2,122	2,233
Depreciation and amortization	10,118	8,114
Corporate and Eliminations [Member]
Operating income (loss)	(17,330)	(15,162)
Capital expenditures	(57)	460
Depreciation and amortization	263	283
Lighting Segment [Member]
Net sales	233,449	189,000
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	20,942	13,328
Capital expenditures	1,017	1,596
Depreciation and amortization	5,782	6,306
Display Solutions Segment [Member]
Net sales	221,671	126,612
Display Solutions Segment [Member] | Operating Segments [Member]
Operating income (loss)	17,589	9,864
Capital expenditures	1,162	177
Depreciation and amortization	$ 4,073	$ 1,525