Note 3- Segment Reporting Information (Details) - Summarized Financial Information by Reportable Business Segments (USD $)	3 Months Ended				9 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 68,603,000	[1]	$ 68,996,000	[1]	$ 231,784,000	[1]	$ 225,605,000	[1]
Operating Income (Loss)	582,000		(946,000)		5,340,000		3,404,000
Capital Expenditures	882,000		1,807,000		3,439,000		4,528,000
Depreciation and Amortization	1,590,000		1,614,000		4,728,000		4,583,000
Lighting Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	48,865,000		52,553,000		164,382,000		167,595,000
Operating Income (Loss)	2,913,000		2,219,000		11,230,000		8,680,000
Capital Expenditures	319,000		1,605,000		1,529,000		2,792,000
Depreciation and Amortization	778,000		688,000		2,229,000		2,062,000
Graphics Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	13,363,000		10,638,000		49,656,000		40,367,000
Operating Income (Loss)	(320,000)		(1,577,000)		798,000		(1,150,000)
Capital Expenditures	29,000		127,000		935,000		361,000
Depreciation and Amortization	262,000		246,000		768,000		704,000
Technology Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	6,375,000		5,520,000		17,705,000		16,482,000
Operating Income (Loss)	855,000		108,000		1,986,000		1,628,000
Capital Expenditures	97,000		72,000		448,000		555,000
Depreciation and Amortization	281,000		395,000		944,000		1,163,000
All Other Category [Member]
Segment Reporting Information [Line Items]
Net Sales			285,000		41,000		1,161,000
Operating Income (Loss)			(231,000)		(183,000)		(642,000)
Capital Expenditures					4,000		39,000
Depreciation and Amortization			42,000		31,000		119,000
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(2,866,000)		(1,465,000)		(8,491,000)		(5,112,000)
Capital Expenditures	437,000		3,000		523,000		781,000
Depreciation and Amortization	$ 269,000		$ 243,000		$ 756,000		$ 535,000

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