Note 3 - Business Segment Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 455,120	$ 315,612
Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	233,449	189,000
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	221,671	126,612
Intersegment Eliminations [Member] | Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	38,310	28,449
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 352	$ 219