Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 123,441	$ 127,069
Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	67,641	67,533
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	55,800	59,536
Intersegment Eliminations [Member] | Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,864	6,143
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 455	$ 66