Note 3 - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Lighting Segment [Member]
Net Sales:
Net Sales		$ 49,331	$ 48,865	$ 168,007	$ 164,382
Operating Income (Loss):
Operating Income (Loss)		1,106	2,913	11,970	11,230
Capital Expenditures:
Capital Expenditures		1,074	319	2,923	1,529
Depreciation and Amortization:
Depreciation and Amortization		730	778	2,152	2,229
Graphics Segment [Member]
Net Sales:
Net Sales		17,162	13,363	59,949	49,656
Operating Income (Loss):
Operating Income (Loss)		1,174	(320)	5,370	798
Capital Expenditures:
Capital Expenditures		2,145	29	3,254	935
Depreciation and Amortization:
Depreciation and Amortization		293	262	721	768
Technology Segment [Member]
Net Sales:
Net Sales		4,247	6,375	13,396	17,705
Operating Income (Loss):
Operating Income (Loss)		888	855	3,221	1,986
Capital Expenditures:
Capital Expenditures		1,626	97	1,850	448
Depreciation and Amortization:
Depreciation and Amortization		$ 392	$ 281	$ 1,111	944
All Other Category [Member]
Net Sales:
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)		$ (2,436)	$ (2,866)	$ (8,686)	(8,491)
Capital Expenditures:
Capital Expenditures		181	437	383	523
Depreciation and Amortization:
Depreciation and Amortization		314	269	919	756
Net Sales	[1]	70,740	68,603	241,352	231,784
Operating Income (Loss)		732	582	11,875	5,340
Capital Expenditures		5,026	882	8,410	3,439
Depreciation and Amortization		$ 1,729	$ 1,590	$ 4,903	$ 4,728

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