Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Inter-segment Revenues	$ 87,466	$ 84,159
Lighting Segment [Member]
Inter-segment Revenues	68,428	65,265
Graphics Segment [Member]
Inter-segment Revenues	19,038	18,894
Intersegment Eliminations [Member] | Lighting Segment [Member]
Inter-segment Revenues	715	753
Intersegment Eliminations [Member] | Graphics Segment [Member]
Inter-segment Revenues	$ 31	$ 132