Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 128,804	$ 111,143	$ 255,873	$ 217,540
Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	66,833	57,276	134,366	108,536
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	61,971	53,867	121,507	109,004
Intersegment Eliminations [Member] | Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	5,067	11,266	11,210	21,723
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 30	$ 72	$ 36	$ 235