Note 3 - Segment Reporting Information - Inter-segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net Sales	$ 774	$ 614
Intersegment Eliminations [Member] | Graphics Segment [Member]
Net Sales	132	444
Intersegment Eliminations [Member] | Technology Segment [Member]
Net Sales	8,785	9,384
Lighting Segment [Member]
Net Sales	60,370	59,075
Graphics Segment [Member]
Net Sales	18,894	22,330
Technology Segment [Member]
Net Sales	4,895	4,520
Net Sales	$ 84,159	$ 85,925