Note 3 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 117,470	$ 110,111	$ 373,343	$ 327,651
Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	66,707	57,126	201,074	165,662
Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	50,763	52,985	172,269	161,989
Intersegment Eliminations [Member] | Lighting Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	5,101	5,683	16,312	27,406
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 175	$ 54	$ 139	$ 289