Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Net Sales:
Net sales	$ 78,156	$ 70,740	$ 247,973	$ 241,352
Operating Income (Loss):
Operating income (loss)	(774)	732	3,110	11,875
Capital Expenditures:
Capital expenditures	790	5,026	3,534	8,410
Depreciation and Amortization:
Depreciation and amortization	2,084	1,729	5,689	4,903
Lighting Segment [Member]
Net Sales:
Net sales	56,039	49,331	176,578	168,007
Operating Income (Loss):
Operating income (loss)	2,759	1,106	8,288	11,970
Capital Expenditures:
Capital expenditures	251	1,074	1,518	2,923
Depreciation and Amortization:
Depreciation and amortization	1,124	730	2,762	2,152
Graphics Segment [Member]
Net Sales:
Net sales	16,463	17,236	55,939	60,772
Operating Income (Loss):
Operating income (loss)	(480)	1,078	1,711	5,271
Capital Expenditures:
Capital expenditures	499	2,145	1,324	3,337
Depreciation and Amortization:
Depreciation and amortization	357	316	1,093	787
Technology Segment [Member]
Net Sales:
Net sales	5,654	4,173	15,456	12,573
Operating Income (Loss):
Operating income (loss)	1,386	984	3,038	3,320
Capital Expenditures:
Capital expenditures	48	1,626	82	1,767
Depreciation and Amortization:
Depreciation and amortization	322	369	991	1,045
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating income (loss)	(4,439)	(2,436)	(9,927)	(8,686)
Capital Expenditures:
Capital expenditures	(8)	181	610	383
Depreciation and Amortization:
Depreciation and amortization	$ 281	$ 314	$ 843	$ 919