Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Sales:
Net sales	$ 84,957	$ 87,466
Operating Income (Loss):
Operating income (loss)	2,934	(24,814)
Capital Expenditures:
Capital expenditures	648	498
Depreciation and Amortization:
Depreciation and amortization	2,643	2,572
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating income (loss)	(3,303)	(3,360)
Capital Expenditures:
Capital expenditures	106	55
Depreciation and Amortization:
Depreciation and amortization	258	292
Lighting Segment [Member]
Net Sales:
Net sales	61,432	68,428
Lighting Segment [Member] | Operating Segments [Member]
Operating Income (Loss):
Operating income (loss)	3,850	(22,930)
Capital Expenditures:
Capital expenditures	276	261
Depreciation and Amortization:
Depreciation and amortization	1,990	1,901
Graphics Segment [Member]
Net Sales:
Net sales	23,525	19,038
Graphics Segment [Member] | Operating Segments [Member]
Operating Income (Loss):
Operating income (loss)	2,387	1,476
Capital Expenditures:
Capital expenditures	266	182
Depreciation and Amortization:
Depreciation and amortization	$ 395	$ 379