Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Goodwill	$ 123,254,000			$ 123,254,000		$ 123,254,000
Accumulated impairment losses	(112,881,000)			(112,881,000)		(92,716,000)
Goodwill, net	10,373,000			10,373,000		30,538,000
Goodwill Impairment			$ (20,165,000)	(20,165,000)	$ (28,000,000)
Lighting Segment [Member]
Goodwill	94,564,000			94,564,000		94,564,000
Accumulated impairment losses	(85,356,000)			(85,356,000)		(65,191,000)
Goodwill, net	9,208,000			9,208,000		29,373,000
Goodwill Impairment			(20,165,000)	(20,165,000)
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