Note 2 - Business Segment Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net Sales:
Net Sales	$ 496,979	$ 455,120
Operating Income (Loss):
Operating income (loss)	37,028	21,201
Capital Expenditures:
Capital expenditures	3,208	2,122
Depreciation and Amortization:
Depreciation and amortization	9,664	10,118
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating income (loss)	(19,525)	(17,330)
Capital Expenditures:
Capital expenditures	6	(57)
Depreciation and Amortization:
Depreciation and amortization	265	263
Lighting Segment [Member]
Net Sales:
Net Sales	272,451	233,449
Lighting Segment [Member] | Operating Segments [Member]
Operating Income (Loss):
Operating income (loss)	31,633	20,942
Capital Expenditures:
Capital expenditures	1,829	1,017
Depreciation and Amortization:
Depreciation and amortization	5,423	5,782
Display Solutions Segment [Member]
Net Sales:
Net Sales	224,528	221,671
Display Solutions Segment [Member] | Operating Segments [Member]
Operating Income (Loss):
Operating income (loss)	24,920	17,589
Capital Expenditures:
Capital expenditures	1,373	1,162
Depreciation and Amortization:
Depreciation and amortization	$ 3,977	$ 4,073