Note 6 - Goodwill and Other Intangible Assets (Details) - Goodwill - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014
Goodwill [Line Items]
Goodwill		$ 75,224	$ 78,343
Accumulated impairment Losses		(64,716)	(67,835)
Net Goodwill		10,508	10,508
LSI Saco [Member]
Sale of LSI Saco
Goodwill	$ (3,119)
Accumulated impairment losses	3,119
Lighting Segment [Member]
Goodwill [Line Items]
Goodwill		34,913	34,913
Accumulated impairment Losses		(34,778)	(34,778)
Net Goodwill		135	135
Graphics Segment [Member]
Goodwill [Line Items]
Goodwill		28,690	28,690
Accumulated impairment Losses		(27,525)	(27,525)
Net Goodwill		1,165	1,165
Technology Segment [Member]
Goodwill [Line Items]
Goodwill		11,621	11,621
Accumulated impairment Losses		(2,413)	(2,413)
Net Goodwill		$ 9,208	9,208
All Other Category [Member]
Goodwill [Line Items]
Goodwill			3,119
Accumulated impairment Losses			(3,119)
Net Goodwill			$ 0
All Other Category [Member] | LSI Saco [Member]
Sale of LSI Saco
Goodwill	(3,119)
Accumulated impairment losses	$ 3,119