Note 4 - Business Segment Information - Summarized Financial Information by Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Net Sales	$ 157,249	$ 138,095
Capital expenditures	967	759
Operating income	10,972	9,131
Long-term performance based compensation	1,282	1,184
Depreciation and amortization	3,200	2,940
Severance costs and restructuring costs	(71)	60
Amortization expense of acquired intangible assets	1,554	1,408
Acquisition costs	220	48
Business Combination, Acquisition-Related Cost, Expense	220	48
Expense on step-up basis of acquired assets	68	67
Consulting expense: commercial growth initiatives	14,027	11,898
Adjusted operating income	1,646	1,532
Depreciation Expense	15,671	13,430
Lighting Segment [Member]
Net Sales	69,054	58,437
Display Solutions Segment [Member]
Net Sales	88,195	79,658
Operating Segments [Member] | Lighting Segment [Member]
Net Sales	69,054	58,437
Capital expenditures	289	712
Operating income	8,549	5,759
Long-term performance based compensation	109	69
Depreciation and amortization	1,262	1,212
Severance costs and restructuring costs	18	60
Amortization expense of acquired intangible assets	603	603
Acquisition costs	0	0
Business Combination, Acquisition-Related Cost, Expense	0	0
Expense on step-up basis of acquired assets	0	0
Consulting expense: commercial growth initiatives	9,279	6,491
Adjusted operating income	673	644
Depreciation Expense	9,952	7,135
Operating Segments [Member] | Display Solutions Segment [Member]
Net Sales	88,195	79,658
Capital expenditures	611	47
Operating income	8,592	7,708
Long-term performance based compensation	215	285
Depreciation and amortization	1,841	1,635
Severance costs and restructuring costs	(90)	0
Amortization expense of acquired intangible assets	951	805
Acquisition costs	0	0
Business Combination, Acquisition-Related Cost, Expense	0	0
Expense on step-up basis of acquired assets	68	67
Consulting expense: commercial growth initiatives	9,738	8,865
Adjusted operating income	888	847
Depreciation Expense	10,624	9,712
Corporate and Eliminations [Member]
Net Sales	0	0
Capital expenditures	67	0
Operating income	(6,169)	(4,336)
Long-term performance based compensation	958	830
Depreciation and amortization	97	93
Severance costs and restructuring costs	1	0
Amortization expense of acquired intangible assets	0	0
Acquisition costs	220	48
Business Combination, Acquisition-Related Cost, Expense	220	48
Expense on step-up basis of acquired assets	0	0
Consulting expense: commercial growth initiatives	(4,990)	(3,458)
Adjusted operating income	85	41
Depreciation Expense	$ (4,905)	$ (3,417)