Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Net sales	$ 72,832	$ 78,843	$ 247,330	$ 258,614
Operating income (loss)	(2,273)	743	(19,610)	(19,524)
Capital expenditures	769	988	2,348	2,178
Depreciation and amortization	2,552	2,516	7,787	7,640
Corporate and Eliminations [Member]
Operating income (loss)	(2,066)	(2,654)	(8,049)	(8,997)
Capital expenditures		17	200	108
Depreciation and amortization	236	273	737	848
Lighting Segment [Member]
Net sales	52,785	61,554	177,871	199,156
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	691	2,982	(13,911)	(14,673)
Capital expenditures	769	671	1,633	1,431
Depreciation and amortization	1,925	1,865	5,867	5,651
Graphics Segment [Member]
Net sales	20,047	17,289	69,459	59,458
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	(898)	415	2,350	4,146
Capital expenditures		300	515	639
Depreciation and amortization	$ 391	$ 378	$ 1,183	$ 1,141