Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended			6 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Goodwill, net	$ 30,538,000				$ 30,538,000		$ 58,538,000
Goodwill Impairment			$ (479,000)		(28,000,000)	$ (479,000)
Lighting Segment [Member]
Goodwill	94,564,000				94,564,000		94,564,000
Accumulated impairment losses	(65,191,000)				(65,191,000)		(37,191,000)
Goodwill, net	29,373,000				29,373,000		57,373,000
Goodwill Impairment		$ (28,000,000)		$ (28,000,000)
Graphics Segment [Member]
Goodwill	28,690,000				28,690,000		28,690,000
Accumulated impairment losses	(27,525,000)				(27,525,000)		(27,525,000)
Goodwill, net	1,165,000				1,165,000		1,165,000
Goodwill Impairment
Technology Segment [Member]
Goodwill	123,254,000				123,254,000		123,254,000
Accumulated impairment losses	(92,716,000)				(92,716,000)		(64,716,000)
Goodwill, net	$ 30,538,000				$ 30,538,000		$ 58,538,000
Goodwill Impairment				$ (28,000,000)