Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Goodwill	$ 99,661	$ 115,401
Accumulated impairment losses	(89,288)	(105,028)
Goodwill, net	10,373	10,373
Lighting Segment [Member]
Goodwill	70,971	86,711
Accumulated impairment losses	(61,763)	(77,503)
Goodwill, net	9,208	9,208
Graphics Segment [Member]
Goodwill	28,690	28,690
Accumulated impairment losses	(27,525)	(27,525)
Goodwill, net	$ 1,165	$ 1,165