Note 2 - Business Segment Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net Sales	$ 305,558	$ 328,852
Operating income (loss)	13,076	(19,890)
Capital expenditures	2,739	2,618
Depreciation and amortization	8,654	10,221
Corporate and Eliminations [Member]
Operating income (loss)	(11,265)	(10,791)
Capital expenditures	260	37
Depreciation and amortization	504	979
Lighting Segment [Member]
Net Sales	206,199	235,114
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	16,123	(12,211)
Capital expenditures	1,386	2,239
Depreciation and amortization	6,714	7,648
Graphics Segment [Member]
Net Sales	99,359	93,738
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	8,218	3,112
Capital expenditures	1,093	342
Depreciation and amortization	$ 1,436	$ 1,594