Note 3 - Inter-segment Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net Sales		$ 715	$ 2,143	$ 533	$ 2,030
Intersegment Eliminations [Member] | Graphics Segment [Member]
Net Sales		275	1,281	132	388
Intersegment Eliminations [Member] | Technology Segment [Member]
Net Sales		$ 8,920	$ 27,236	$ 6,788	21,735
Intersegment Eliminations [Member] | All Other Category [Member]
Net Sales					308
Lighting Segment [Member]
Net Sales		$ 49,331	$ 48,865	$ 168,007	164,382
Graphics Segment [Member]
Net Sales		17,162	13,363	59,949	49,656
Technology Segment [Member]
Net Sales		$ 4,247	$ 6,375	$ 13,396	17,705
All Other Category [Member]
Net Sales					41
Net Sales	[1]	$ 70,740	$ 68,603	$ 241,352	$ 231,784

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