Note 3 - Segment Reporting Information - Inter-segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 85,658	$ 84,687	$ 169,817	$ 170,612
Lighting Segment [Member]
Net sales	60,169	59,601	120,539	118,676
Graphics Segment [Member]
Net sales	20,582	21,206	39,476	43,536
Technology Segment [Member]
Net sales	4,907	3,880	9,802	8,400
Intersegment Eliminations [Member] | Lighting Segment [Member]
Net sales	713	814	1,487	1,428
Intersegment Eliminations [Member] | Graphics Segment [Member]
Net sales	680	562	812	1,006
Intersegment Eliminations [Member] | Technology Segment [Member]
Net sales	$ 8,346	$ 8,932	$ 17,131	$ 18,316