Note 3 - Segment Reporting Information (Details) - Summarized Financial Information by Reportable Business Segments - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Net Sales:
Net sales	[1]	$ 85,925	$ 78,466
Operating Income (Loss):
Operating Income (Loss)		5,763	2,534
Capital Expenditures:
Capital Expenditures		1,362	970
Depreciation and Amortization:
Depreciation and Amortization		1,576	1,586
Lighting Segment [Member]
Net Sales:
Net sales		59,075	55,721
Operating Income (Loss):
Operating Income (Loss)		5,682	4,227
Capital Expenditures:
Capital Expenditures		689	582
Depreciation and Amortization:
Depreciation and Amortization		705	722
Graphics Segment [Member]
Net Sales:
Net sales		21,753	16,024
Operating Income (Loss):
Operating Income (Loss)		2,161	53
Capital Expenditures:
Capital Expenditures		505	334
Depreciation and Amortization:
Depreciation and Amortization		215	250
Technology Segment [Member]
Net Sales:
Net sales		5,097	6,680
Operating Income (Loss):
Operating Income (Loss)		1,340	632
Capital Expenditures:
Capital Expenditures		116	44
Depreciation and Amortization:
Depreciation and Amortization		355	338
All Other Category [Member]
Net Sales:
Net sales			41
Operating Income (Loss):
Operating Income (Loss)			(183)
Capital Expenditures:
Capital Expenditures			4
Depreciation and Amortization:
Depreciation and Amortization			31
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating Income (Loss)		(3,420)	(2,195)
Capital Expenditures:
Capital Expenditures		52	6
Depreciation and Amortization:
Depreciation and Amortization		$ 301	$ 245

[1] Net sales are attributed to geographic areas based upon the location of the operation making the sale.