Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net Sales	$ 71,010	$ 72,832	$ 242,088	$ 247,330
Operating income (loss)	2,631	(2,273)	11,230	(19,610)
Capital expenditures	419	769	1,538	2,348
Depreciation and amortization	2,080	2,552	6,631	7,787
Corporate and Eliminations [Member]
Operating income (loss)	(2,486)	(2,066)	(8,575)	(8,049)
Capital expenditures	59		246	200
Depreciation and amortization	83	236	435	737
Lighting Segment [Member]
Net Sales	49,013	52,785	165,640	177,871
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	1,102	691	13,411	(13,911)
Capital expenditures	126	769	1,013	1,633
Depreciation and amortization	1,650	1,925	5,089	5,867
Graphics Segment [Member]
Net Sales	21,997	20,047	76,448	69,459
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	4,015	(898)	6,394	2,350
Capital expenditures	234		279	515
Depreciation and amortization	$ 347	$ 391	$ 1,107	$ 1,183