Note 4 - Segment Reporting Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net Sales	$ 106,397	$ 70,006
Operating income (loss)	4,444	2,202
Capital expenditures	297	405
Depreciation and amortization	2,563	2,033
Corporate and Eliminations [Member]
Operating income (loss)	(3,644)	(3,209)
Capital expenditures	(104)	9
Depreciation and amortization	71	56
Lighting Segment [Member]
Net Sales	51,260	45,405
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	4,339	3,588
Capital expenditures	180	369
Depreciation and amortization	1,461	1,619
Display Solutions Segment [Member]
Net Sales	55,137	24,601
Display Solutions Segment [Member] | Operating Segments [Member]
Operating income (loss)	3,749	1,823
Capital expenditures	221	27
Depreciation and amortization	$ 1,031	$ 358