Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net Sales	$ 70,006	$ 88,701
Operating income (loss)	2,202	6,839
Capital expenditures	405	355
Depreciation and amortization	2,033	2,399
Segment Reconciling Items [Member]
Operating income (loss)	(3,209)	(3,337)
Capital expenditures	9	25
Depreciation and amortization	56	235
Lighting Segment [Member]
Net Sales	45,405	63,191
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	3,588	9,159
Capital expenditures	369	330
Depreciation and amortization	1,619	1,778
Graphics Segment [Member]
Net Sales	24,601	25,510
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	1,823	1,017
Capital expenditures	27	0
Depreciation and amortization	$ 358	$ 386