Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 127,069	$ 106,397
Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	67,533	51,260
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	59,536	55,137
Intersegment Eliminations [Member] | Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	6,143	10,457
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 66	$ 163