Note 3 - Inter-segment Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net Sales		$ 814	$ 445	$ 1,428	$ 1,497
Intersegment Eliminations [Member] | Graphics Segment [Member]
Net Sales		562	125	1,006	256
Intersegment Eliminations [Member] | Technology Segment [Member]
Net Sales		8,932	7,675	18,316	14,947
Intersegment Eliminations [Member] | All Other Category [Member]
Net Sales					308
Lighting Segment [Member]
Net Sales		59,601	59,796	118,676	115,517
Graphics Segment [Member]
Net Sales		21,034	20,269	42,787	36,293
Technology Segment [Member]
Net Sales		4,052	4,650	9,149	11,330
All Other Category [Member]
Net Sales					41
Net Sales	[1]	$ 84,687	$ 84,715	$ 170,612	$ 163,181

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