Note 4 - Segment Reporting Information - Intersegment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Inter-segment Revenues	$ 110,111	$ 72,204	$ 327,651	$ 218,597
Lighting Segment [Member]
Inter-segment Revenues	57,126	45,740	165,662	136,271
Display Solutions Segment [Member]
Inter-segment Revenues	52,985	26,464	161,989	82,326
Intersegment Eliminations [Member] | Lighting Segment [Member]
Inter-segment Revenues	5,683	6,880	27,406	15,998
Intersegment Eliminations [Member] | Display Solutions Segment [Member]
Inter-segment Revenues	$ 54	$ 46	$ 289	$ 159