Note 3 - Segment Reporting Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Net Sales	$ 117,470	$ 110,111	$ 373,343	$ 327,651
Operating income (loss)	7,732	5,161	26,791	14,027
Capital expenditures	759	531	1,754	1,276
Depreciation and amortization	2,455	2,531	7,295	7,632
Lighting Segment [Member]
Net Sales	66,707	57,126	201,074	165,662
Display Solutions Segment [Member]
Net Sales	50,763	52,985	172,269	161,989
Operating Segments [Member] | Lighting Segment [Member]
Operating income (loss)	6,529	4,959	22,441	13,921
Capital expenditures	402	272	725	624
Depreciation and amortization	1,344	1,450	4,113	4,361
Operating Segments [Member] | Display Solutions Segment [Member]
Operating income (loss)	5,501	4,556	19,759	12,142
Capital expenditures	338	185	1,038	660
Depreciation and amortization	1,044	1,021	2,993	3,068
Corporate and Eliminations [Member]
Operating income (loss)	(4,298)	(4,354)	(15,409)	(12,036)
Capital expenditures	19	74	(9)	(8)
Depreciation and amortization	$ 67	$ 60	$ 189	$ 203