Note 7 - Goodwill and Other Intangible Assets (Details Textual)		1 Months Ended
	Mar. 01, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Lighting Segment [Member]
Good will Impairment Testing Value Above Carrying Value	$ 89,000,000
Good will Impairment Testing Percent Value Above Carrying Value	112.00%
Graphics Segment [Member]
Good will Impairment Testing Value Above Carrying Value	$ 1,700,000
Good will Impairment Testing Percent Value Above Carrying Value	183.00%
Technology Segment [Member]
Good will Impairment Testing Value Above Carrying Value	$ 15,400,000
Good will Impairment Testing Percent Value Above Carrying Value	59.00%
Customer Relationships [Member] | LSI Saco [Member]
Finite-Lived Intangible Assets, Gross				$ 1,036,000
Finite-Lived Intangible Assets, Accumulated Amortization				$ 428,000
Customer Relationships [Member]
Finite-Lived Intangible Assets, Gross		$ 9,316,000	$ 9,316,000
Finite-Lived Intangible Assets, Accumulated Amortization		7,509,000	7,290,000
Number of Reporting Units	3
Impairment of Long-Lived Assets Held-for-use		0
Indefinite Lived Intangible Assets Impairment Testing Value Above Carrying Value	$ 8,400,000
Indefinite Lived Intangible Assets Impairment Testing Percent Value Above Carrying Value	245.00%
Finite-Lived Intangible Assets, Gross		22,052,000	22,052,000
Finite-Lived Intangible Assets, Accumulated Amortization		$ 19,761,000	$ 19,382,000