Note 3 - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Lighting Segment [Member]
Net Sales (a):
Net Sales		$ 59,601	$ 59,796	$ 118,676	$ 115,517
Operating Income (Loss):
Operating Income (Loss)		5,182	4,090	10,864	8,317
Capital Expenditures:
Capital Expenditures		1,160	599	1,849	1,181
Depreciation and Amortization:
Depreciation and Amortization		717	729	1,422	1,451
Graphics Segment [Member]
Net Sales (a):
Net Sales		21,034	20,269	42,787	36,293
Operating Income (Loss):
Operating Income (Loss)		2,035	1,065	4,196	1,118
Capital Expenditures:
Capital Expenditures		604	533	1,109	867
Depreciation and Amortization:
Depreciation and Amortization		213	256	428	506
Technology Segment [Member]
Net Sales (a):
Net Sales		4,052	4,650	9,149	11,330
Operating Income (Loss):
Operating Income (Loss)		993	499	2,333	1,131
Capital Expenditures:
Capital Expenditures		108	241	224	285
Depreciation and Amortization:
Depreciation and Amortization		364	325	719	663
All Other Category [Member]
Net Sales (a):
Net Sales					41
Operating Income (Loss):
Operating Income (Loss)					(183)
Capital Expenditures:
Capital Expenditures					4
Depreciation and Amortization:
Depreciation and Amortization					31
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating Income (Loss)		(2,830)	(3,430)	(6,250)	(5,625)
Capital Expenditures:
Capital Expenditures		150	61	202	67
Depreciation and Amortization:
Depreciation and Amortization		304	242	605	487
Net Sales	[1]	84,687	84,715	170,612	163,181
Operating Income (Loss)		5,380	2,224	11,143	4,758
Capital Expenditures		2,022	1,434	3,384	2,404
Depreciation and Amortization		$ 1,598	$ 1,552	$ 3,174	$ 3,138

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