Note 6 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Goodwill	$ 115,401	$ 123,254
Accumulated impairment losses	(105,028)	(112,881)
Goodwill, net	10,373	10,373
Lighting Segment [Member]
Goodwill	86,711	94,564
Accumulated impairment losses	(77,503)	(85,356)
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