Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Net Sales	$ 315,612	$ 305,558
Operating income (loss)	8,030	13,076
Capital expenditures	2,233	2,739
Depreciation and amortization	8,114	8,654
Segment Reconciling Items [Member]
Operating income (loss)	(15,162)	(11,265)
Capital expenditures	460	260
Depreciation and amortization	283	504
Lighting Segment [Member]
Net Sales	189,000	206,199
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	13,328	16,123
Capital expenditures	1,596	1,386
Depreciation and amortization	6,306	6,714
Display Solutions Segment [Member]
Net Sales	126,612	99,359
Display Solutions Segment [Member] | Operating Segments [Member]
Operating income (loss)	9,864	8,218
Capital expenditures	177	1,093
Depreciation and amortization	$ 1,525	$ 1,436