Note 3 - Segment Reporting Information -Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net Sales:
Net sales	$ 85,658	$ 84,687	$ 169,817	$ 170,612
Operating Income (Loss):
Operating income (loss)	2,818	5,380	3,884	11,143
Capital Expenditures:
Capital expenditures	784	2,022	2,744	3,384
Depreciation and Amortization:
Depreciation and amortization	1,770	1,598	3,605	3,174
Lighting Segment [Member]
Net Sales:
Net sales	60,169	59,601	120,539	118,676
Operating Income (Loss):
Operating income (loss)	2,738	5,182	5,529	10,864
Capital Expenditures:
Capital expenditures	183	1,160	1,267	1,849
Depreciation and Amortization:
Depreciation and amortization	791	717	1,638	1,422
Graphics Segment [Member]
Net Sales:
Net sales	20,582	21,206	39,476	43,536
Operating Income (Loss):
Operating income (loss)	1,174	1,959	2,191	4,193
Capital Expenditures:
Capital expenditures	459	604	825	1,192
Depreciation and Amortization:
Depreciation and amortization	376	237	736	471
Technology Segment [Member]
Net Sales:
Net sales	4,907	3,880	9,802	8,400
Operating Income (Loss):
Operating income (loss)	924	1,069	1,652	2,336
Capital Expenditures:
Capital expenditures	22	108	34	141
Depreciation and Amortization:
Depreciation and amortization	324	340	669	676
Corporate and Eliminations [Member]
Operating Income (Loss):
Operating income (loss)	(2,018)	(2,830)	(5,488)	(6,250)
Capital Expenditures:
Capital expenditures	120	150	618	202
Depreciation and Amortization:
Depreciation and amortization	$ 279	$ 304	$ 562	$ 605