Note 7 - Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Goodwill	$ 99,661	$ 115,401
Accumulated impairment losses	(89,288)	(105,028)
Goodwill	43,788	10,373
Goodwill acquired	33,415
Lighting Segment [Member]
Goodwill	70,971	86,711
Accumulated impairment losses	(61,763)	(77,503)
Goodwill	9,208	9,208
Goodwill acquired	0
Display Solutions Segment [Member]
Goodwill	28,690	28,690
Accumulated impairment losses	(27,525)	(27,525)
Goodwill	34,580	$ 1,165
Goodwill acquired	$ 33,415