Note 3- Business Segment Information (Details) - Summarized Financial Information by Reportable Business Segments (USD $)	3 Months Ended				6 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 84,715,000	[1]	$ 76,123,000	[1]	$ 163,181,000	$ 156,609,000
Operating Income (Loss)	2,224,000		1,511,000		4,758,000	4,350,000
Capital Expenditures	1,434,000		1,491,000		2,404,000	2,721,000
Depreciation and Amortization	1,552,000		1,561,000		3,138,000	2,969,000
Lighting Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	59,848,000		57,380,000		116,369,000	116,851,000
Operating Income (Loss)	3,964,000		2,157,000		8,084,000	5,968,000
Capital Expenditures	599,000		696,000		1,186,000	1,187,000
Depreciation and Amortization	744,000		703,000		1,482,000	1,409,000
Graphics Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	18,740,000		12,954,000		32,551,000	26,962,000
Operating Income (Loss)	460,000		(275,000)		246,000	(112,000)
Capital Expenditures	523,000		177,000		857,000	234,000
Depreciation and Amortization	251,000		232,000		499,000	453,000
Electronics Components Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	4,598,000		4,073,000		10,478,000	9,153,000
Operating Income (Loss)	625,000		1,041,000		1,364,000	2,013,000
Capital Expenditures	241,000		413,000		280,000	483,000
Depreciation and Amortization	310,000		367,000		632,000	733,000
All Other Category [Member]
Segment Reporting Information [Line Items]
Net Sales	1,529,000		1,716,000		3,783,000	3,643,000
Operating Income (Loss)	605,000		124,000		689,000	128,000
Capital Expenditures	10,000		10,000		14,000	39,000
Depreciation and Amortization	5,000		42,000		38,000	82,000
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(3,430,000)		(1,536,000)		(5,625,000)	(3,647,000)
Capital Expenditures	61,000		195,000		67,000	778,000
Depreciation and Amortization	$ 242,000		$ 217,000		$ 487,000	$ 292,000

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