Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net Sales	$ 82,377	$ 89,541	$ 171,078	$ 174,498
Operating income (loss)	1,760	(20,271)	8,599	(17,337)
Capital expenditures	764	931	1,119	1,579
Depreciation and amortization	2,152	2,592	4,551	5,235
Corporate and Eliminations [Member]
Operating income (loss)	(2,752)	(2,680)	(6,089)	(5,983)
Capital expenditures	162	94	187	200
Depreciation and amortization	117	243	352	501
Lighting Segment [Member]
Net Sales	53,436	63,654	116,627	125,086
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	3,150	(18,452)	12,309	(14,602)
Capital expenditures	557	588	887	864
Depreciation and amortization	1,661	1,952	3,439	3,942
Graphics Segment [Member]
Net Sales	28,941	25,887	54,451	49,412
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	1,362	861	2,379	3,248
Capital expenditures	45	249	45	515
Depreciation and amortization	$ 374	$ 397	$ 760	$ 792