Note 3 - Segment Reporting Information -Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Lighting Segment [Member]
Net Sales:
Net Sales	$ 60,370	$ 59,075
Operating Income (Loss):
Operating Income (Loss)	2,791	5,682
Capital Expenditures:
Capital Expenditures	1,084	689
Depreciation and Amortization:
Depreciation and Amortization	847	705
Graphics Segment [Member]
Net Sales:
Net Sales	18,894	22,330
Operating Income (Loss):
Operating Income (Loss)	1,017	2,234
Capital Expenditures:
Capital Expenditures	366	588
Depreciation and Amortization:
Depreciation and Amortization	360	234
Technology Segment [Member]
Net Sales:
Net Sales	4,895	4,520
Operating Income (Loss):
Operating Income (Loss)	728	1,267
Capital Expenditures:
Capital Expenditures	12	33
Depreciation and Amortization:
Depreciation and Amortization	345	336
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating Income (Loss)	(3,470)	(3,420)
Capital Expenditures:
Capital Expenditures	498	52
Depreciation and Amortization:
Depreciation and Amortization	283	301
Net Sales	84,159	85,925
Operating Income (Loss)	1,066	5,763
Capital Expenditures	1,960	1,362
Depreciation and Amortization	$ 1,835	$ 1,576